XtoDVD Problem with encoded size

HI. I have been using XtoDVD and am generally happy with results.
Lately I am ending with built folder much smaller than set target.
So I sometimes up the target to a larger value as a workaround.
But now this is not helping and I am getting anything between 39 and 45%
occupation.
Would appreciate your help.
I have 2HDS 40G and 120G
OS is WINXP PRO SP2 (Build2600)

05/11/2007 01:18:19 info ********** Report session closed ***********
05/11/2007 01:17:57 info --------------Encoding end--------------
05/11/2007 01:01:06 info Total size in built folder 3172 Mb., Target size DVD9 8100 Mb., Occupation 39.16%
05/11/2007 01:01:06 info Conversion completed in 01:09:39
05/11/2007 01:01:06 info Generated duration 7023.06 sec., expected 7023.11 sec.
05/11/2007 01:01:06 info Ext. Subtitle file D:\My DVDs\AVI Files\Evening[2007]DvDrip[Eng]-aXXo.srt has provided 1332 / 1332 entries
05/11/2007 00:58:09 info Chapter #15 start at 112:6.980
05/11/2007 00:53:51 info Chapter #14 start at 104:46.540
05/11/2007 00:48:53 info Chapter #13 start at 96:6.020
05/11/2007 00:44:00 info Chapter #12 start at 88:5.540
05/11/2007 00:38:57 info Chapter #11 start at 80:5.060
05/11/2007 00:35:18 info Chapter #10 start at 73:44.680
05/11/2007 00:30:06 info Chapter #9 start at 64:44.140
05/11/2007 00:24:52 info Chapter #8 start at 56:13.380
05/11/2007 00:20:14 info Chapter #7 start at 48:32.920
05/11/2007 00:16:26 info Chapter #6 start at 41:52.520
05/11/2007 00:11:22 info Chapter #5 start at 33:12.000
05/11/2007 00:06:18 info Chapter #4 start at 24:31.480
05/11/2007 00:01:06 info Chapter #3 start at 16:10.980
04/11/2007 23:56:02 info Chapter #2 start at 8:10.500
04/11/2007 23:51:27 info Stream #2 Sync. delay : 0.00 ms
04/11/2007 23:51:27 info Stream #1 Sync. delay : 0.00 ms
04/11/2007 23:51:27 info Stream #0 Sync. delay : 0.00 ms
04/11/2007 23:51:27 info Output Stream#2 - subtitle (eng)
04/11/2007 23:51:27 info Output Stream#1 - Audio: ac3, 48000 Hz, stereo, 192 kb/s, no automatic gain control
04/11/2007 23:51:27 info Output Stream#0 - Video: mpeg2video, yuv420p, 720x576, q=1-31, 8808 kb/s
04/11/2007 23:51:27 info Video Stream #0 Pulldown : 23.976 -> 25.00 Fps
04/11/2007 23:51:27 info Image processing: Fast bilinear resampler (644260)->(720416)
04/11/2007 23:51:26 info Image processing: Pad (Left:0 - Top:80 - Right:0 - Bottom:80)
04/11/2007 23:51:26 info External Subtitles: Total 1332 entries built
04/11/2007 23:51:26 info Ext. Subtitle file D:\My DVDs\AVI Files\Evening[2007]DvDrip[Eng]-aXXo.srt loaded - 1332 entries found
04/11/2007 23:51:26 info Video source original frame rate: 23.98
04/11/2007 23:51:26 info Output resolution: FULL D1 [720*576]
04/11/2007 23:51:26 info PAL 25 FPS output format set by user
04/11/2007 23:51:26 info Widescreen (16:9) set automatically
04/11/2007 23:51:26 info Video bitrate 0/8808/8808 Kbps (min/avg/max)
04/11/2007 23:51:26 info Converting “D:\My DVDs\AVI Files\Evening[2007]DvDrip[Eng]-aXXo.avi”
04/11/2007 23:51:26 info ----------------Title #1----------------
04/11/2007 23:51:26 info Video bitrate has been set to maximum possible value for DVD specifications. Target size may not be reached.
04/11/2007 23:51:26 info Project size 7.91 Gb. (164 Mb. audio - 7.74 Gb. video)
04/11/2007 23:51:26 info Stream #1 - Audio: mp3, 48000 Hz, stereo, 112 kb/s
04/11/2007 23:51:26 info Stream #0 - Video: mpeg4, yuv420p, 644x260
04/11/2007 23:51:26 info 2 Stream(s) found - est. duration 01:57:03.106
04/11/2007 23:51:26 info Opening file “D:\My DVDs\AVI Files\Evening[2007]DvDrip[Eng]-aXXo.avi”
04/11/2007 23:51:25 info [ ] Don’t fix audio gaps
04/11/2007 23:51:25 info [ ] Engine Log
04/11/2007 23:51:25 info Encoder quality: 100%
04/11/2007 23:51:25 info --------------Encoding begin--------------
04/11/2007 23:51:25 info --------------Menu settings end--------------
04/11/2007 23:51:25 info [ ] Menu
04/11/2007 23:51:25 info --------------Menu settings begin--------------
04/11/2007 23:51:25 info --------------Default burn settings end--------------
04/11/2007 23:51:25 info Default speed selected: 4x
04/11/2007 23:51:25 info Compatible media types : DVD-R, DVD-RW Seq., DVD-RW RO, DVD+R, DVD+RW, CD-R, CD-RW, DL DVD+R
04/11/2007 23:51:25 info New Drive selected : 1:0:0 - PIONEER DVD-RW DVR-108 1.20 [F] (Ide)
04/11/2007 23:51:25 info [ ] Delete files after burn complete
04/11/2007 23:51:25 info [ ] Don’t eject after burn complete
04/11/2007 23:51:25 info [ ] Prefer SAO for DVD-R
04/11/2007 23:51:25 info [ ] Include originals
04/11/2007 23:51:25 info [ ] Burn result to DVD
04/11/2007 23:51:25 info --------------Default burn settings begin--------------
04/11/2007 23:51:06 info User default language : 2057 (0x0809h) - English (United Kingdom)
04/11/2007 23:51:06 info System default language : 2057 (0x0809h) - English (United Kingdom)
04/11/2007 23:51:06 info Version 2.2.3.258
04/11/2007 23:51:06 info ExeName : “C:\Program Files\vso\ConvertXtoDVD23\ConvertXtoDvd.exe”
04/11/2007 23:51:06 info OS : Microsoft Windows XP Professional Service Pack 2 (Build 2600)
04/11/2007 23:51:04 info ******************** Report session started ********************