Drastic adjustments between stars and party sngs?

[skeemer1]

I 9 tabled the party $30 & $50 sngs for almost a year with good results, 18% ROI & 41% ITM, through about 6000 games (with a 43% ITM & 37% ROI in the last 800 or so games on there) but with the recent legislation i have been forced to move to stars. I decided to start at the $25 turbos just to adjust to the differences in structure, but thru about 500 tourneys i only have a 35% ITM & 4.6% ROI.... I know i have not been playing as well as possible, but i havent played THAT bad. I am just curious if anyone else has had a similar experience and what adjustments typically need to be made?