Set of weighted Otter Boat keels. $100 plus ship
Set of Cannon boom dual rod holders. $75 plus the ride.
Located in Buffalo and can meet halfway depending where you are to save on ship.
I've never used those weights, but make sure the fins are straight. Next thing I would suggest is lowering the riggers a bit slower and see if that helps. You never did specify what's getting tangled, your lines or riggers cables.
If what suggested above doesn't work, and you have two of the same riggers, swap the spools and see what happens. If the same issue occurs on the other rigger, wire issue. Much cheaper and easier fix than a board.
some people use crimps, some use beads. I'm a fan of beads. Double the line through the bead, slide the small fly on, repeat for as many flies as you want. This will also allow you to adjust the distance between flies if you want. I use 50lb ANDE fkouro.
A Penn 330 will fit 300' 45# copper with 300yds 30# braid backer great. This weekend, I squeezed in 200yds 40# braid backer and 350' 45# copper on Penn 330. It's tight, but doable.