Maybe I suck. But my dad and I couldn't get 2" thick 7 foot+ boards to edge joint perfectly on the jointer. Same for the (kick ass) tablesaw. So DK this one's for you. This is our homemade edge jointing jig... later replaced with a straight board (after the aluminum started to flex).
Are you sure that big-ass straight bit wasn't a shaper bit?
If a piece of notebook paper fits your gap, you're good. Another tip is to make it dished slightly to allow for possible movement to NOT eff up your nice boards. If you can make the middle of your joint the widest point of your gap, glue and clamps should take care of the rest, and you've got the added benefit of when the wood expands and contracts with seasonal changes, the edges won't split on you.
If you know what a caul is (and I'm betting SOMEONE you know sure as heck does, given all the woodworking apparatus), what I'm trying to explain is that exact shape on both.....crap, lemme know if you're understanding what I'm saying. If not, I'll photoshop a quick pic.