I tried this on Chips forum, but not answer yet.

I know, it's been asked before but not really answered. A few had posted everything should be 0 but Chip replied why would you want to change the top wing incidence? Normally I'd be fine with that but my front and rear cabane A frames are exactly the same height. The front frame is supposed to be about a 1/4 inch higher. When I mount the top wing it puts it in a negative incidence position. Given my A frames are the same height should I shim the front up to 0 degrees? This is one of the first kits so who knows lol.