I have the same macpac escapade 750xl.......I traveled 60 km to go back into store and swap regular size (which I had tried in the shop much to wifes horror) for the xl size...I can sleep totally inside bag without shoulders cramping....during warmer months I unzip all but the foot box and sleep under it inside a cheap warehouse sleeping bag liner which has its own wee cover about the size of regular coffee cup/coke can the liner boosts heat in winter and keeps me semi decent in summer if in company of others...it works as a meat bag in a pinch too....no good to sleep in until been through wash again though.
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