I prefer spoons to jigging raps so I am no expert here, but on the bay for whitefish we use strictly jigging raps and we actually do the opposite of you out there. We remove the treble at the bottom and leave the end hooks. However, the reason for this isn't because of how the whitefish hit, but since we pound the bottom so much, the bottom hook tends to hook into zebra muscles and rocks. So removing it decreases how often we have to reel up 50+ feet to take off whatever it hooked into.
I can't say we catch more fish because of how they are hitting, the only reason we catch more fish this way is because there is more time in the water.