Your motor has a factory rating for top r.p.m. (revolutions per minute) at w.o.t. (wide open throttle). Check with the manufacturer to see what this number is. Then, run the boat and see if you hit max rpm. If you do, then you have the right prop.
A 70hp on a 22ft boat sounds a little underpowered for what your trying to do. I think your going to find that your need would be better met by going with a larger motor on you boat, a 90hp or 125hp, if allowable per manufacturers specs, will make a bigger difference.
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