More rotation means more power. The H16 is heavy for its sail area, so more power is usually good.
Maybe on a mast with diamonds it does, but not on a H-16. More rotation = less power because the mast bends more, flattening out the sail.
And a Hobie 16 is wildly overpowered - it only has 7 sq ft. less sail area than an F-18, and weighs 80 lbs less.
Replacing the mast step is fairly easy, even if the old step is corrosion welded to the dolphin striker.
1) loosen the nuts on the dolphin striker.
2) drill the heads off the 4 rivets that hold the base to the front crossbar, then drive the rivet tails in with a 3/16" punch
3) use a dead blow hammer to hammer up on the dolphin striker so the base comes off the front crossbar.
4) unscrew the old base (big-ass monkey wrench helps). If it's frozen on, use a hacksaw or a angle grinder to put a couple of vertical cuts in nearly to the center, then use a cold chisel to split it.
5) clean up the threads with a wire brush and screw on the new step.
6) use a scissors jack (car jack) between the crossbar and the dolphin striker to pull it back down. You can use clamps, too.
7) drill hols for new rivets, install new rivets to hold to crossbar.
8) re-tighten dolphin striker nuts.
This shouldn't take you more than an hour.