Nice work! Makes sense that the AC condensor isn't getting as much air flow so the AC won't be as efficient as before.
One of the trade off's with adding an oil cooler is preheating the air going through the radiator which reduces it's capacity somewhat. Shouldn't be an issue for DD since there's no difference in the radiator for the manual or auto tranny cars and the auto tranny cooler sits in front of the radiator too. You'll want to keep an eye on water temp when you start tracking the car and running it really hard.
'96 328iC "Marie"
R.I.P 14 November 2013