PokerTracker

Ideally i'd like a set of custom hand stats for pot size by street. so one column would be flop pot in bb, one would be turn pot in bb, and river pot in bb. I think i can just modify the pot size stat to somehow include the street i want it to reflect. then have an average of the hand values at the bottom of the report.

There is a 'Pot Sizes on each street' custom statistic in the Download Warehouse. Importing that will give you custom columns for the pot size on each street which you can then duplicate, divide by the size of the big blind (cash_limit.amt_bb) and then create new statistics with.