I've only burned a handful of DAXON AZ2's (BENQ 8x +R), but I noticed PIE/PIF improved somewhat when using B7U9 @ MBIPG101 R05 write strategy. Unfortunately, I haven't tried any other firmwares and/or write strategy combo's.
B7U9 @ default write strat:
PIE's @ 40,585 - 46,878 (15-24 max) / PIF's @ 464-1,738 (6-7 max)
B7U9 @ MBIPG101 R05 write strat:
PIE's @ 22,719 - 29,396 (11-17 max) / PIF's @ 362-407 (5-6 max)
.... If the DAXON AZ2 media are anything like MBIPG101 R04's, then I'd expect a LOT of variation from disc to disc - even within the same spindle. I suppose that's the difference b/t good / consistent media like YUDEN000 T02's and the cheaper alternatives.