Your results are not very good i must say, have you looked at our review? We didn't had such problems, maybe your unit is defective?
It turned out that my brand new drive was defective indeed. I've RMA it and got a new drive. Very good technical support from Plextor.be I have to say!
I've tested the new unit and I've posted my old vs new results, plus few new ones, here: http://forum.cdfreaks.com/showthread.php?t=99294&highlight=plextor+px-712a
Even with the new unit, I seem to get very bad results with RITEK R03 Rev02 media (Infinity 8x and Ridata 4x@8x) ... This still doesn't look very normal to me ... any ideas?
Although a definite improvement over the first drive, I'm still not very impressed with the results I'm getting with the new unit ... I hope I haven't got another "weird" drive