Pond Boss Forums AERATION Systems questions 8 acre pond at 10,000' - lots of aeration ?s

This is definitely a learning curve project. You will not find a lot of experienced experts for your specific project. My opinion is for your size of 'pond' it is better to use the larger compressor to circulate more water for a shorter period each day. The diffusers in the deepest water will move more water volume per diffuser due to height of the rising water column compared to a similar sized diffuser in shallower water.

It does not surprise me that the windmills are struggling to maintain open water which helps a lot to explain why your trout have been dying each winter.