Will be watching to see how this turns out. We have the '12 X23B and our awning looks exactly like yours but we do not have the slack that you do. I'm guessing you checked the awning arms to make sure they are extending all the way and not binding. I'll bet the awning is cut a tiny bit long tho.
2013 F-350 CC SB 2WD 6.7PS
2013 Eagle Premier 351 RLTS
-SOLD- 2012 X23B
-SOLD- 2003 Ford Expedition 5.4, Bilstein shocks