It sounds like you have already decided on a frame and are stuck in a frame size decision.

You may want to step back a bit and consider the larger frame geometry decision. I, for example, have long legs and a short upper body so I look for a frame that has a relatively shorter top tube. There's a good bit of variation across models. Use the calculator or another one and then look at the frame geometry online to hone in on models worthy of test driving or size options within models. The relatively longer top tube on the Surly Cross-Check is the reason I sized down to a non-XL bike for the first time since puberty.

I honestly can't believe at 6'3" you're going to have a standover problem on even an XL frame. On my L Cross-Check it is a 34" standover w/ 700c wheels and 700x35 tires and I have a good 3+ inches (35.5 pants inseam). -- CORRECTION: 4+ inches in bare feet, measured it just now.

Actual crotch height >> pants inseam. Shoe thickness, cuffs aren't dragging, you're not garotting the jewels, etc.