Sounds like a great pond to me!
Do you and family/friends have the ability to fish and remove 200 bass per year in your slot? I would think so.
I think tiger musky are pretty smart predators, but I am not sure you can teach them to read your slot limit rules.
If you remove the bass yourself, then you can control the numbers and assume some annual number of natural morts, to have a pretty good idea on "bass removed".
I am definitely NOT an expert on your type of fishery. However, I think I would want my chain pickerel to thrive. They can eat your small crappie if your pond ever starts moving toward a stunted crappie situation. They should also eat some of the smaller bass, so you can have more of you total bass carrying capacity in larger fish. Have the chain pickerel spawned in your pond?
The chain pickerel record for Virginia is under 8#. The musky record is over 45#. That fish would eat whatever it wanted to eat in your pond.
IMO, I would see how well the pond was achieving my fishing goals with the current mix of fish. If something is off, perhaps you could add musky later. (I have no idea if large bass would eat a 12" stocked musky, or if they are too quick.)
OTOH, if you wanted to have trophy tiger musky as one of your bonus fish, perhaps a 20-acre pond is just big enough to pull that off!
