Stalling at idle in gear

Timing does not drop when it goes in gear. That stays the same.

I'd like to get it to idle at 850-900 in neutral and 750-800 in gear. One reason I have it up as high as I do is that if I hold the throttle to 1300ish RPM in gear when it starts to stall it won't stall.
Would the stall speed of the converter have anything to do with the drop in rpm from neutral/park to being in gear? If it's miss-matched that could cause the large drop correct?
Thanks!