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Hi Richard!
Had the same problem with my Roush 427R and QFT750. Changing the inital timing, Powervalve and increasing the mainjet was my first way to success. I still have a small lean spot between 1.400 and 1.600 rpm at cruising but think (and hope) i will solve it with the squirters. Have more or less the same sea level like you but different engine, carb size and carb type - so sharing my jetting would not help you. Had an emission test with CO and HC (AFR) that helps a lot.
If you are a member from ÖAMTC you will have access to an emission test.
Greetings from the other end from Austria
Peter
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