On your topic of planer blades, I've used the Big Jon "Willie" blades for years... in both fresh water and salt. They work great...takes about 0.5-knots to keep them planning... they're reversible and you can get spare parts from Big Jon. Pulling a spread of six with two down-lines under them has caught a lot of stripers.
The only two negatives are the black brackets are easy to break... so watch that and small sharks/bluefish will nail them from time to time . Pic below.
Catch um up,