I have not found any extra holding power in the standard ratchamatic, just less friction. I have found a way to double the holding power but I don't know if you can use it.

The Marstrom A-Class has an additional mainsheet block on the end of the boom attached to the outhaul. I am using ratchamatic single for that block. It makes a difference.

For your boat- one of the problems with having the ratchet just behind the cleat is the wrap angle is not that good. If you put the ratchamatic on the boom (part of your triple or quad) you would have 180 degree of wrap and better holding. If you keep your old base, you could turn the rachet off and on as needed. You can ask Harken or test it. I would test it using 2 bases for blocks and turn the clickers off and on the see what the effect is. AND I would rig this on shore because the potential for screw-ups is huge.

FYI I use an 8 or 9:1 and gloves on a A-Class