Fan Belt issue

[Cobra #3170]

I am having an on going problem with the fan belt on my FE and wondering if anybody has had something similar and perhaps solved the problem.
The front of my engine has three separate belt drives, the first is a cogged belt for the Dailydry sump pump, next is a Dayco top cog multi- ply V belt driving the alternator and water pump. The last belt is a 6 rib micro vbelt driving the power steering pump. I have a Nippondenso 65 amp alternator out of a Camry that is mounted on the right hand side of the engine similar to original stock location. The lower pivot is a 5/8" bolt and the upper mount picks up two places on the water pump so it is very solid. I spent considerable time aligning the pulleys and believe they are very close to perfect although they may not be under load. The alternator has a standard depth v pulley that does not allow the belt to drop down in the v, it uses a tapered metric shaft. I added a bolt over the top of the belt about half way along the distance to the water pump to try and prevent any harmonic belt oscillation which helped a little.
The problem: Any time the engine gets over about 7600 - 7700 rpm it tosses the belt
it is so bad they I carry 5 extra belts with me because I never know when one will come off, sometimes they last for several weeks of autoxing today we lost two belts 10 minutes apart. Packaging a serpentine drive would be a nightmare because the alternator pulley is really close to the upper suspension cross member. I am thinking a deep groove alternator pulley might help but finding one for this alternator would be tough. Current belt is a 15445 which is relatively short. Any ideas?