I'm using UDS1 firmware again, and I noticed there are two less disc strategies from UYS3... I think that's what Omnipatcher reports anyway. I did notice you said 4x seemed best, so I may give the +R a go.
Do you have any suggestions for DL media? I'm having some trouble distinguishing Dual Layer and Double Layer and whatever else is reported.
I did put a blank GQ in the drive and that's what it reported: 4x and 10x. When I put a GQ cd that was already burned, it reported speeds up to 24x.