The Potatonator has 1-4ft weak to slightly punchy waves handled as long as they have any easyish take off. The Dominator is a great board and even though I don't think I will surf it as much now having the PNator and the Hellrazor i will keep it and take it out every now and then if the waves are head high, i don't enjoy it in smaller weak surf. If the waves are punchy, got a bit more of a sucky or quick take off i will surf the Hellrazor in 2ft and up to what ever i can paddle it into.
I think that depending on the waves you are surfing you could get away with a 2 board quiver of a PNator and a Hellrazor. I have gone slightly bigger in the board sizes as the waves in WA have a lot of power in them and you need to be up and going early, if you are under gunned you don't catch waves or you go over the falls.....just the way it works for me :)
I have had some funs waves on the Sweet Spud but also had some sessions were i didn't enjoy it......probably more me than the board. I think that there is a point in when you go to small and wide you lose that plaining/glide ability of a board slightly longer even if that longer board has less volume. Having the Potatonator now i don't think i will surf the Sweet Spud as i have surfed the Potatonator the same places as the Sweet Spud and had a blast on it.
I have surfed the Hellrazor a few times on waves similar to the Dominator i.e. head high, nice and punchy, and not thought that i had wished i had taken out the dominator.