I know this won't be the most helpful post for your problem, but after buying a Benq 1620, I've come to the conclusion that although there might be some disc quality drop off between T01 and T02, Lite-On might also bear some responsibility. Here are two burns with T02- first done with Benq 1620 B7U9, second done with 851@832 CG5G; both scanned with the Lite-On.
Even more telling is that the Benq burn was done at 12x, while the Litey could only manage that at 6x (on somewhat of a tangent, my T02s had a sweet spot of the almost never used 6x on the Lite-On, so you might try that if all else fails). I was especially perturbed about the noticable early rise in errors, which I observed on every T02 burn I did with my Lite-On, and on yours as well.
I don't mention this to convert anyone or to be discouraging about Lite-Ons, but simply to say that maybe Lite-On got the T01 strat right on, but is just a little bit off on the T02 and that combined with a bit of a quality drop off in discs, this is the best we will ever get. Someone with better knowledge of the differences between T01 and T02 can overrule me, but that's my layman's $.02
P.S. Before anyone jumps on me, I know both burns are well within spec, but the noticable mountain early on still bugs me. I would even be more comfortable with a burn that split the difference with a more constant PI level, say at 12 or 15 or so.