Whirl Wind 70" versus 75"

[herman pahls]

I am shopping for a new prop more out of curiosity than need.
Model 4 Kitfox (700#'s) , 912 RotaxULS (100hp), 29" ABW's.
The Warp Drive 70" taper tip with leading edge protection performs well both short field and cruise (100-115 mph above 10,000msl).
It is starting to show the abuse from a steady diet of sand and gravel bars.
I would not mind going to a prop with less mass moment of inertia (MMofI).

Whirl Wind (WW) suggested their 75" fits my flying style but I will lose some cruise.
The WW 75" will have more MMofI than the 70" but less than the current Warp.
McDeans say they sell mostly 70" WW for the 912's (100hp) and 75" to the 914's.

Questions.
1. Any experience out there with the WW 75" with 912ULS?
2. WW says their blades fit the Warp Drive hub 80% of the time.
Has anyone tried WW blades on a Warp hub?
3. Any experience switching from a WW 70" to a WW 75"?

I am considering a big bore kit in the future.

I do not want to make a mistake thinking bigger is better.
Apparently most of the Air Master users are using WW 70" blades with 100HP.

Thanks
Herman