A lighter pin will accelerate quicker and achieve a higher velocity, but carries less energy in the end. A heavier pin will probably have the same momentum but more energy. Longer lock time. I would think a lighter pin with a skeletonized hammer would be the right combination. But then again it may not be significant enough to make a difference.
Ignoring the weight I’d rather have the longer pin.
I haven’t reloaded .45 in over 8 years and turns out I need to put more crimp than what I used loading for 1911. Had one bullet back out while testing today. Had to demoon 150 rounds re-crimp then Re-moon them. What a pain.