Got on the water at last this morning, 28deg C and flat calm, but you didn't want to know that!!
The Suzuki S/S prop, 20in Pitch, behaved very well, giving great acceleration and bite in tight turns. The WOT was just over 6,100rpm with 2 up so I expect it to drop to circa 5,900 with 4 on board, just what I want. Now to the downside, I lost about 2 to 3 knots on my speeds at 4,000, 4,500, 5,000 and 5,500 RPMs, top speed at 6,100 is now only 37-38 kts. It is better than the 19in Pitch Aluminium prop but not as good as the 21in Aluminium prop fitted as standard. In addition, having also tried the 22in S/S Suzuki prop, which only gave me a WOT of 5,500rpm I am going to stick with my new 20in one. It is very smooth and to response is great.
However, I question if the benefits gained (or otherwise) are worth the investment??