Please don't take this the wrong way, but if you do a relearn, or over time as the allison learns the new shift timing does it mitigate the effect.
I am sure they are a great upgrade and I am only asking questions because as you know I have yet to have the privilege of personal experience.
I have shimmed the accumulator springs and the truck seemed to shift crisper but it went away. Or I got used to it. Sometimes you just cant tell.
Maybe the OP can add some info here as well because it sounds like he has some miles on them too.
The effect the springs have as far pressure coming on sooner will not be learned around. That's the point of the springs the shift quality is a benifit of the springs doing their job. Wide open throttle shifting is not changed with these springs.