Placing your homemade diffuser in your frontage ranging from 4ft to 6ft deep, AND periodically every two weeks move the diffuser to a different area of your frontage could make a noticeable difference of the bottom area of your property frontage . Ideally IMO the more often you can move the diffuser the better the muck will be reduced. This plan could provide improved benefits of muck digestion. IMO your goal is to not mix the water above the sediment but to mix, agitate and oxygenate the sediment layer that the diffuser is lying in. The lifted oxygenated sediment will be quickly be lifted and dispersed to another area where it can be optimally decomposed because it is now oxygenated. Anytime one looses oxygen in organic material decomposition is drastically reduced and muck accumulates.
For your special situation, I would let the diffuser tubing frame sit flat on/in the bottom sediment to maximally lift sediment and mix the general bottom zone area to better oxygenate the sediment for improved muck oxygenation and movement of the sediments. Improved oxygenation of the sediments will enhance and diversify the benthic macroinvertebrate community consisting of worms and insect larvae that initially process the organic sediments. Bacterial decomposition are the final processers.
In addition I would buy some of the muck digesting pellets or nuggets composed of decomposing bacteria and place several muck digester nuggets in each new area where the diffuser is working. These two things of sediment mixing and added bacteria digesters should help digest and reduce the mucky layer areas where the diffuser has bubbled for 1-2 weeks. Over the summer this method should help reduce the amount of muck in your frontage area. If water is clear enough or someone walks in the diffuser operation zone try and notice if muck has diminished during the summer. This visual or personal touching evaluation will help you decide how and if to proceed with this method in 2023. Please report back here how your plan is working during the summer.
Normally I am not a big fan of microbe bacterial additions for ponds especially if the water has not been chemically treated for algae. However in your case study, I think the muck digester additions will do no harm and may actually improve muck digestion in your lake frontage area. This is not to say the productivity of the lake will not add it's annual organic deposits to your lake frontage each year.
Some examples of bacterial muck digesters:
Weeders Digest ShoreTech Industries - Muck Reducer Pellets
https://weedersdigest.com/shore-tech-muck-reducer-pellets-lake-pond-sludge-remover-bacteria/ Laboratory formulated from high performance beneficial bacteria, bio-vitamins, probiotics & enzymes specifically designed for breaking down & eliminating organic sludge buildup on the bottom of in lakes and ponds along with degrading floating algae mats. Helps clear water and restore healthy oxygen levels
The Pond Guy Airmax MuckAway
https://www.amazon.com/ShoreRestore-Digester-Pellets-Naturally-Sediment/dp/B01IJC8I2W
