The boat should have rounded up if your weather helm is correct and not capsized. Each boat has its own optimal angle of heal for speed vs. leeway - usually around 20-25 degrees. Aside from reefing (main first) the boat can be depowered by flattening the main, running the traveler down side to spill wind and by feathering the main by releasing a little main sheet. Overhealed is not fast nor comfortable. A common mistake of new sailors is to overtrim - often sheeting out alone will allow the boat to stand up on its lines
and sail faster.