Yeah i would lighten the weights in the front pulley by drilling them open a little more. That's a pretty straightforward and effectively free way to keep it in the power earlier.
The proma circuit is going to be your best bet for lower rpm power. It's a very solid all around pipe. You'll probably need to re-engineer that bash guard though.
Heck, it might be worth it to try a pipe before messing with the variator tuning. The stock suitcase exhaust doesn't really provide much.
also, that bike is so cool (edited)