First of all, a slimdrive never will be able to burn in parity with halfhigh (ordinary) drive, no matter what model.
Post us some scans with DW1655, thanks.
Not completely truth, on almost any slimdrive you can solder pins; 47/48/49 (order depends by model) to get drive running in desired IDE mode.
There is much more to it but I’ll spare some aces.
[I]BTW,[/I] my Lenovo laptops (have 2 the same) use the same chipset “Mobile Intel GM965 Express”. And I must say I’m very satisfied with LG [GMA-4082N] DVDRW burners. No problems with Vista/XP/SuSE in multiboot setup. Minimum 2GB memory ofcourse.