Bolboot,
I'm here for you baby! Thanks for getting a fit before you purchased (brilliant!) and for writing in with lots of good data. I'm gonna proceed here in terms of a disc brake Canyon Speedmax SLX (if we're talkin' rim brake let me know as that's a whole different geometry and prescription).

You, like many, can fit on two sizes. In this case it's a Large and Medium but the Large puts you in a corner* and the Medium is far better. On that Medium you will need the longer stem**, medium extension, and mid spacer. It will place you in a nice spot where you have room to tweak and adjust fore/aft/up/down to find perfection.

*If you got the Large you'd use the short stem**, medium extension, and you'd be absolutely slammed; the lowest the pads go on a Large is just 1mm lower than your Pad Y of 636. If you're positive that you are riding at the lowest you'll ever be than okay, the Large will work.

**We keep staying "stem" but just so we're clear it's not a stem. It's a cockpit of molded one piece carbon that is the "stem" plus the base bar. If you're buying in the US you get what comes stock (short cockpit) and then you have to a) purchase the longer cockpit and then b) have that installed (keeping in mind that brake lines and whatnot run through the cockpit and into the frame).

"can the handle bar raise up 50 degrees so my wrists are in a more neutral position" - If you mean can the base bar rotate up so that the bull horns/grip at the brake levers can be tilted up the answer is no, that cockpit is fixed. If you mean can the aerobars be tilted the answer is yes but 50 degrees is an unrealistic number - that's beyond preying mantis and almost no one rides at that tilt. The disc brake SLX can be tilted up 3 degree or 6 degrees - and while I've doubled up on those wedges and built a 9 degree tilt that is verboten by Canyon's recommendations and is said to be unsafe. You might also be speaking about the aerobar extension grip itself and for that I can say there's a VERY cool feature where you can adjust the aerobar grips to be pretty much any angle you want (up to something nutty, near vertical, like 80 degrees).

Now for the last note regarding pad width of 220 center to center. The widest the pads will go on the new, disc brake Speedmax SLX is 175mm. Now, I haven't yet done this but I know it's coming soon to my fit studio; I'm gonna have someone, probably a guy with broad shoulders, a swim background, etc who has to go wider. I'm going to take his bike to my local machine shop and ask them to make me a plate that I can bolt on to the bracket and then put the arm pad on top of that out to a width that satisfies. It'll cost probably $30 and I'm gonna have them make five sets for me.

Get back to me here if you have more questions.

Ian