I actually like the 67 gr idea. Alpacas are currently, what, 62 gr? I find them a little light.
67 gr would be interesting, and probably unique. I'd also be okay with 65 gr. Something just a little heavier than stock.
I'm surprised that people are enjoying the 62 gr weight so much. The Alpaca is a great switch, but I am bottoming-out more than I should because it is so smooth and offers so little resistance. It's too fun to press all the way down, so a little more weight could help.