I followed an integrated course before (Sabena Flight Academy, so very similar to OAA). I flew with them around 40 hours on DA20-c1 in Arizona and 30 hours IR FNPTII sim (DA42) in Brussels. Plus I did my ground school with them.
I had a problem with the last part of the landing (final / short final couldn't see that I was drifting from the center line). The problem was solved with Chandler, plus I increased my general airplane handling proficiency.
So believe me I'm more than aware of what you are talking about!