I run the smaller tx12 church boards. I run upgraded lock jaws so the board can not slip at all. I run 2 ounce wieghts and bandits quite often as a norm. The little boards handle it like a champ. The smaller boards are easy to read without flags and pull back out of line when a fish is on. Drop the rod tip and reel and they will clear without having to trip them. If the fish comes off, i just free spool back into position without having to reset everything.
As far as board diving, thats vause you have the rod tip to high deep seas fishing. Jjst put the rod tip at the water and reel easy. Keep the board coming in on its keel, keep the walleye off the surface.