I am no expert, but I can give you some answers.
1. The stunted LMB will gain weight, but because of the stunting will probably never reach trophy size. It is the newly born bass who will perform best. Keep removing bass.
2. Depends on how you define healthy. In short I'd say yes, but it is a challenge. Remove every crappie you catch! Crappies and BG can compete for certain food sources. Feeding your BG will also help. If you want to grow really large BG, then you'd want to keep the LMB overpopulated and hungry.
3. Yes, it would be OK to electrofish the pond. In fact, it'd make things a lot easier. If you haven't already done an electroshock survey of your pond, you may learn quite a bit.