Ric and Theo offer sound advice.With only 10 ft of depth I would move the diffuser to higher ground and perhaps run at night only. Highly suggest monitoring your water temps at 50% of depth.Research labels for your State and County and see if Sonar PR is an option. It will set the Elodea back slowly for this season. Next year apply it early in the season. Also consider treating 10% strips at a time with Diquat and a vegetable based surfactant with Sonar.Every 5-10 days do another 10% Mechanical removel in the deep spots wont warm your water a lot as most of the temp increase is probably coming from your aeration. Stay away from even the low rates of chelated coppers as warm temps copper and trout dont mix even at very low rates.Depending on your diffuser type and compressor you may be able to slow the system down also by bleeding of some of the exhaust.If moving the diffuser is not practical you may also be able to add risers to the discs,stones,tubes or whatever you are using and leave the weight base in the same location.
