1.5NA is the worst for power of the lot, 48hp at like 4400rpm. Which explains why you have to run the bag off of it to get up a hill.. 5000ft elevation doesn't help either haha.With the white smoke on start-up its telling me you are a smidgen too advanced. Back it down a touch until you get the perfect cold start then you have the best setting.
While I have a fondness for the under-dog, I have very very seldom heard anything good about the 1.5.Keep an eye out for a TD.