Sounds like you have the classic over populated stunted LMB pond...
First thing I would do is remove every single bass you catch. 3/4 acre, you should be able to make a dent in the population. I'd look to removed 50-75 pounds of bass. Start recording weight and length of each bass and all fish caught for that matter. Calculate relative weights on the bass and others and track progress.
I would not waste my money on adding any FHM.
I would also remove every catfish caught of any species and continue removing all crappies caught.
As you are doing this, the addition of some shallow cover would help as well. Good luck!
