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Yes I agree; I should've tried it with inline post. It totally needs that. I tried maximum on a setback post.
With Power as you said it's like arione and SMP mixed with best of both. The sitbone support is so much better than arione and no squishing of anything; I have a crit on 30th that'll properly test it.
Another thing is its not 'that' pricey with starting model at £80 (porky but ok) and has same shape and padding all the way to fancy s-works.
tl;dr: If you use romin and love it; try power it'll be even better esp in aggressive position.
One thing I can tell you is that you're used to conventional saddle like that Specialized, so going back to it is like going back home.
It does take more than a couple weeks to get the hang of it, and constantly moving it further forward than you think.