I would not attempt after reading just your one post to evaluate & offer advice on management of a 23ac lake esp. with that diversity even if I had the credentials.
It is unlikely your presentation of any material will convince a neighbor that already thinks you are wrong.
You need a third party.
With that large a lake it shouldn't be hard to find someone in the community your neighbors trust & respect & you can reason with that also would like to fish the lake.
Find that person/s & take them fishing. Then ask if they would be willing to help.
Use the common trusted friend to call a meeting to discuss the welfare of your pond.
Contact a lake management pro & have them give a sales pitch. He should show just for the potiential business.
