Yeah. I suggest telling us what size Terminators you're using, so that we can give you a suggestion. [8D]

Seriously, Terminators are a fairly hefty arrow. If you're worried about them being a little stiff, I'd dump the 100 gn tips and go to 125's. The extra tip weight will do two things for you. Improve the arrows' spine match to your bow AND move your FOC further forward, making for a more stable arrow.