Well, if the center shot and windage isn't set properly, you could have properly spined arrows giving you the problems you indicated.

For me I like to paper tune from 6' then again at 10-12' and adjust for a bullet hole to make sure the shaft is coming out of the bow straight. I think with a compound properly tuned and centershot with a behind the arrow mechanical release, too stiff is rarely an issue where spine is a potential concern.

You may just try it to see if your issue is something as simple as the arrow not getting a straight down the pipe shove, assuming this is how you're set up.