If the OP is a semi skilled player I think it's decent to assume he could sustain over 15-20% ROI long term, especially if he's willing to put in the time to improve his game along the way.
p.s. for the record, I ran at 17% at $19 av. buyin for nearly 3k games on stars(standard speeds).
I am not a hater also.
Agree with the 15-20 in long term, the leader in Fultilt leaderboard in $5´s for October run a 21% ROI with 1000+ games, so yes is reacheable, but like Debi say you are talking about the very good players.
Also OP first mention his ROI was around the 30% mark (in first and 2nd post), then later comment was 27% ROI in 300 games in $5s, but from those 300, 200 was in $2 games and 100 in $5´s, so telling his ROI is going to be lower is not because of hate, is been objective, a 15-20% ROI is way different than 27%-30%, and you know that 100 games don´t say much.
But the importance in the topic more than his ROI was is question about move up with 22buyins wich don´t sound that good.
Anyway, OP already jump to $11´s so we will see soon if his ROI holds.