How are you leaving (launching) off the line? IMO, assuming that the converter actually flashes to 3500 from launching off idle, it dead hooked, with a 1.65 60' time you're at least in the ball park (a little faster and quicker) in the 330', 660', 1/4 and mph times. So your 60' time should be better by a little just on your other times and speed, but it appears you are likely down on power also for what your combo is. Just a guess but my opinion comes from my experiences and that I use my chosen guide (chart) as a reference (target) that shows what times one should ideally be run with a particular 60' time, 1/8 and 1/4 time and mph. Comparing the numbers will indicate where the shortcomings likely are. This works for me, others have their methods but you have to have targets and reference points to get somewhere. Hard to say what your state of tune is or what stall your seeing or how you're launching off the line but I'd think you should be seeing more mph, quicker et's and better 60' times. Tune some more (I'm slightly obsessive when it comes to that!) if you haven't and then look at converter.
