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Thank you all for the helpful advice & feedback. I must say a lot of info to digest.

Since the F70 is a higher RPM motor, smaller diameter prop? To maximize speed, higher pitch?

Again Currently, running Yamaha 3 blade aluminum 13 5/8 x 14"

Sounds like I have potential to really increase my performance & speed vs. what I am currently running. That said, I want to do my homework to get this right.

I'm still not sure what stainless size & pitch to aim for, for my hull & outboard, and for my applications (from my previous posts).

Here is everything I have heard:

Brands:
Yamaha Performance Series
Yamaha Painted Stainless (YPS)
Power Tech SCD3
Turbo Quest
Stiletto Advantage

Diameter & Pitch:
- 13-1/4" x 14"

- 13.25 x 15"

- 13.25" x 13"

- 13.5" x 16"

- 13" X 17"

By the way
Interesting article re: prop pitch
http://www.boatingmag.com/how-to/understanding-propeller-pitch