I want to chip my truck, but....

[Itorchedparis]

So I have a 2000 7.3l crew cab 4x4 with 133,000 miles. When I bought the truck there was a slight issue with the tranny when shifting from 1-2. It really punches itself into gear sometimes, but not always. It seems to do it more often when the truck is going downhill or fairly level plane. I've never had it happen when going uphill which is weird to me. It had an edge evo installed when I bought it and made the shifting issue 10x worse. I want to chip my truck for some extra performance, but i'm worried I'm just going to have the same shifting issue as before. Any suggestions/thoughts? Thanks!