I wouldn't remove bass until you have another predator in there, i.e. HSB (or northern pike, or tiger muskie) to control the crappie. But the second you have the other predator in place, removing several bass as soon as possible would be a good idea.
You might start by removing crappie, as they could be as much of the problem as too many bass.
The bass to remove normally would be the ones 12" and under, but if they're that unhealthy, you might just remove any bass that's under 20" unless it's atypically healthy.
The GSH aren't going to solve it without removing crappie and bass both.
