Pond Boss Forums AERATION Systems questions Diffuser Locations and Turnovers per Day???

I am putting together plans for and aeration system and wanted to run it by everyone.

Given:

Qty x 3, 9" Vertex diffusers,
Gast 0523 Pump
Triangular Shaped 1/4 acre Pond = 423,000 gallons, 10 foot at deepest, average depth = 6 feet.
Location - West Central Mo.
Fish - HSB, HBG, RES, FHM

Turnover Calculation:

Two diffusers in separate areas at 4 foot water depths and a single diffuser in 10 foot yields 10 turnovers per 24 hour
period. I would like to use the 3 isolated diffusers to help the water surface conditions (floaty pollen, dust, etc) and achieve good turn over rates.

Advice Requested:

Is there such a thing as too much turnover? If so, I can cut the aeration periods to the night time according to the magic number of turnovers and temperature requirements.

Should I consider moving the deepest diffuser up to the 6 or 7 foot depth to try and maintain a small thermocline for heat relief OR would that be futile in such a small pond?

Any and all comments welcome, thanks in advance...