20/2 vs. 30/3 on Stars

[Shorty35]

My ROI in the 20+2's on Stars is over 40% (just shy of 100 sample size). But in the 30/3's (only about 50) I am -8% (two bad streaks and one good one).

I "feel" like I have been playing well, but the results speak for themselves. I know the sample is small, but still....

Do you notice any signficant jump in the quality of play at 30 vs. 20? Or do I just need to let it play out over a larger number of games? (Bankroll is not an issue at these levels)