winbarrows, your bad burns are not burner related. :disagree:
Taking a look at your logfile we can see that burn took more than 17 minutes to burn on not an full disc. This makes the average burn speed of less than 4x, (or approx. 4.2MB/s)...
I assume constant drive buffer underruns because enclosure chipset is not able to handle the appropriate data stream to drive.
With current firmwares DW165* shouldn't be used in external enclosures, if your enclosure doesn't hold Prolific or latest Cypress chipset. Check out chas0039 Ext. enclosures burn tests.
But even then your burnspeed will be limited to 12x max at best.
Sorry to say winbarrows, with current setup, you'll not be able to produce good burns. Looking for low speed rated (8x) +R media might be an option but won't solve your basic problem.
FireWire might be an option, but sofar no information if your setup can run on it.
ck, your "problems" are not in any way related to the ones described here.
Try to burn that media at 12x with WOPC disabled.