With all due respect lets be perfectly honest hear, its very easy to hand pump a board to 11.6 psi, its above 15 psi that it gets seriously difficult.
IMHO my redair doesn't feel at all great until its 18psi and above, especially when in the surf.
Its a case of ill believe it when i see it with the 20psi pump claims and above.
Technology is charging ahead every day with the race boards, i have full faith there will be a light, practical 12v 20 psi pump that works in the near future, but i don't see it as a priority for SUP manufacturers, i wish it was though.
IMO you need a pump that pumps fast low psi and then slower for the higher psi to get to 20psi or above, i would think 25psi is more than ample . The problem with most pumps must be they are one speed type pumps, as mentioned two stages is better but i think 3 or 4 stages is needed once the psi gets above 15 or so.
When i pump my board up i do it in 3 stages, each being harder to pump as the psi gets higher.
I got some emails from redair claiming also there are electric pump options but they don't show any videos to prove the claim on their site. I would be interested to see the NZ claims, i suspect they use a tyre compressor with an adaptor hose or something, but im just guessing.
Feel free to prove me wrong please.