I've ridden the 160 & 163 burton Sherlock in deep deep Japan pow and they float fine. Absolutely did not feel like I was missing out on a pow board (of which I have owned and ridden many: off the top of my head - 56&60 fish, 64 Charlie slasher, 66 gentem slasher, 62 malolo, 59 landlord, 59 cheetah, 52 con artist, barracuda, 62& 68 gyrator, 48 fishcuit, 63 juice wagon, fanatic royal fish & more).
You know what's a great twin for pow? The nug! I'm now on the Root and love it in all conditions