Hacker and gogzy are dead on. Most of my experience is at 25 max, and most of my big mistakes (impacting results) have come from deviating from ABC poker.
Playing ABC in that field can be frustrating in bad runs, or rather when donktards keep defying all logic and taking your cash way more than they should. Kinda makes me understand why PH gets so pissed all the time when he loses.
Post some PT numbers though. That usually provides some insight.