I'm familiar with the optics on that bow. A Hawke 3x32 will be a step up. They are $79 Also Parker Red Hot is another version of the Hawke with a different reticle, they are $99 both will get you to nearly dark without a problem.
As far as great light gathering, consider a low power variable along with the HHA Optimizer. A high quality 1.5x5 or 2x7 that has a single reticle is a great combination with the optimizer. Pretty much 0-30 and you will be good without having to play with the dial, past thirty, dial the HHA and you are gold. I tested the HHA and it is dead on accurate.
A cheaper alternative is a straight 3 or 4x power of better quality than you have. Hawke makes very good crossbow scopes.
I support all hunters, regardless of weapon or technique!