What exactly did you have done? Just a shift kit? I have a modded 4L60E in my Trailblazer with the TransGo HD2 shiftkit, .500 inch boost valve and a vette servo and I spin through the 1-2 shift at WOT. The 2-3 is a little firm and 3-4 feels stock. I have done no changes to the PCM yet, this is just with replacing physical parts so the computer still shifts it like its stock.
Like KirkEvil said, you shouldn't adjust any of the line pressure, espcially if you just threw a kit in with the stock internals. Depending on your tune, for example through PCM4LESS, you can adjust shift firmness and timing, but you still wouldn't want to do that on a trans with just a shiftkit and what I would assume to be a lot of miles.
~Matt
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