hard shift

ok, 505" wedge, 727 full auto, 3:73 dana rear. working the bugs out of a 7 yr build ( I`m old).
I adjusted the lokar kick down, and it`s shifting the way I want . w/ exception of a terribly hard upshift automatically to drive-from 2nd gear. with a 3500 loose convertor, it seems a little mushy in the low to second shift in normal driving, I can live w/ that. but I`m afraid its going to tear something up on the 3 gear shift, especially if it`s any harder under full throttle.
comments from trans experts, or any one that has experienced this please---------bob