Hi, Sigma. I know what you mean about the Glock grips - never could get used to 'em mahself! I am used to old warhorses like Browning Hi Powers and 1911s, which have a grip angle different from the Glocks, and I just seem to hit a bit too high with the Glocks, I think because of the grip angle. So, rather than trying to teach "new tricks" to my "old-dog" self, I just stick with what already works well for me. I do seem to do okay with the Sig semi-autos though too - I have had a couple of P220s and a P239, and I was able to shoot them both pretty well.
One of the things that caught my eye was where you said, "This gun fits so well in my hand ..." Springfield is a manufacturer with a good reputation for turning out good-quality firearms, and it oughta be completely reliable. The fact that it feels good to you will likely help you shoot it well, not just because it feels good, but also because you will have confidence in it. I know that in my own experience (which is more with rifles than handguns), I seem to hit better with rifles I have a history with - those that just feel natural, and then put the little round ball where I intended.
If you can, you might try to find a range or a person who has one of these pistols that you can rent or borrow to try out. If there's no way to do that, then I still bet that the fact that you are already so sold on the Springfield XD enough to post what you said about it, I'd say ...
"Go Get It!"
... and as previously mentioned, shoot it alot, and several hundred-rounds worth through the pistol and your carry magazines with the ammo you intend to carry BEFORE you actually start carrying it for keeps.
Best,
Jon