An electrofishing survey will give you an accurate snapshot of what's happening with your bass population. Using the same gear, the proper sizes and numbers can be removed. It would take some time but even a lake your size can be managed. Like some of the others suggested, fire up the grill and/or call the neighbors! Most large private lakes don't get the harvest pressure needed to maintain good growth and size structure. Catch and release has its applications...but doesn't sound like there's enough pressure (harvest) to maintain long-term growth in your lake. Hope this helps.