Re: Why a racer for cruising discussion...
"She doesn't stop on a dime anymore, if that makes sense?" More stuff equals more mass equals you need more force to accelerate it, or "un"accelerate it. So yes, your engine will need to do more work. I would guess that if the engine has enough hp, you could regain some performance by moving to a larger prop, or a different pitch. If you run the new laden weight of the boat versus a prop guide, that should give you some numbers.
And then if you install a double-decker shower, of course the hot water goes twice as far, it just isn't quite as hot when it reached the son on the lower deck.(G)