The things you can achieve in ponds (not lakes or reservoirs) with a feeding program are vast, and every pond is different, so no assumptions are concrete.
Regarding Channel Cats, my preferred stocking number is 10-15 in a .25 acre pond, so by my experience, you're not too far off that number. Nothing wrong with harvesting CC. Some other considerations are if your CC are spawning, and what size of CC you would need for future stockings to avoid predation by the LMB.
Because it seems like the one CC pictured in your original post may be on the thinner side, and the fact that you do have a feeding program, it may be a good idea to consider your forage base. Trying to amp up the bluegill population via favorable spawning sites and perhaps a size of grower feed would probably benefit your CC and LMB.
You may also want to consider a Golden Shiner Frye stocking which should be available in a few weeks.
