Not sure I'd recommend injecting air into the well flow. Problem is you need to blow off nitrogen gas and possibly hydrogen sulfide gas. That has to be open air. Nitrogen gas is supersaturated in well water and needs to be reduced.
Here in Indiana one trout pond owner increased his flow this year and was just dumping his well water into the pond. The trout come up to the area of the inflow and many were croaking. My guess is they are coming up close during hot weather, but the D.O. level was too low in the well water, and there could have been some hydrogen sulfide that wasn't being blown off along with some nitrogen.
IMHO dropping the water via gravity through a packed column is the way to go. However, seems to me you guys are doing O.K. with what you are doing. If it ain't broke don't fix it...
