My dad used to say that ALL sailors are racers-- an opinion shared by many sailors and designers. You're racing the other guy, or your best time, or the storm that's closing in from eight miles on your quarter. Just 'flubbing around' out there isn't what a Hunter 33 was designed to do. The object of this boat, as it is with any good sailing boat, is to get where you're going as quickly and safely as possible with the least possible effort.
Instead of asking where the 'sweet spot' is, find it yourself. It'll be where the speed drops off and increased heel angle (and discomfort) doesn't increase it. In all sailing, speed is indicative of efficiency. Very few boats move faster by becoming less efficient. If something you do makes the boat slow down, don't do that. If something you do makes the boat speed up, do that instead.
I will say this, though-- the Cherubini-designed boats are intended to HEEL over. My little H25 likes about 22-25 degrees. Get used to it-- take down the bimini to be able to actually see where you're going, secure excess gear where it doesn't conspire to get the boat out of trim, and practice good helmsmanship so your wake doesn't look like a slinky. Believe me, it's experience & education worth having and fun as well.