I've found that sometimes the weight on my rigs will turn over the knot placing it under the weight in a procarious position. I don't know if this is what causes it, but I have had three breakoffs on decent fish that shouldn't have broke off otherwise. Anyone else experiencing this?

No, but check you lure/ line before casting.

I'm always picking something off or adjusting

the bait.Checking the rig is just part of the process.