What to do...

Biggest thing i see looking at your incrementals is that its relatively soft on the bottom.
Considering the altitude it making good power. Should be happy about that.
Would agree 32-34 timing is likely the sweet spot.
I would again say the convertor is costing you some without a doubt, and i agree with others the intake is very likely not optimal either. Victor would likely pick it up on the bottom.
MPH is plenty to go 11.30’s easily. Get that 60 in line, you are there.
You say 11.75 compression, i assume zero deck flattops is what you have? Or are they in the hole some. With a 60cc head i would think 12.2-12.4 ish compression if zero’ed out.
What head gasket?