Not bad at all on the weight considering all the mods!

2 oz weight difference between those props???

Zingers are okay once they are re-worked to improve the leading and trailing edges of the airfoil. I have used them straight-up and modified, and they are a lot quieter and more efficient if the leading edge is smoothed out and shaped properly, and the trailing edge thinned out to eliminate the factory square cut.

Maybe try a Xoar beech if they make them in the smaller sizes.