indeed tom i have no doubt that sfs tip will flow more the b5 tip (v1) but v2 is another story i personally the desaign on v2 will give it that little bit extra but for maybe 1-2bhp can't justify the price to be honest
its 15-17lbft More Torque..... the main difference on V2-80mm to V1-3"... and more power.. gains everywhere where the V1 lost ~10lbft initial torque but sustained it 1000-1500rpm longer hence making it more power.
V2 looses nothing anywhere, only gains... and significant like below example.

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