I think the scarp1 would be fine for you, I am 6'2" and there is lots of room to spare. My only complaint about it would be that the packed length is a bit long, and of course that the floor is the slipperiest material know to thermarest, my 2 complaints would be.... I'll come in again.
I had thought of diluting some silicon and painting it onto the base of the mat to see if that gave it some grip.
My new tarptent scarp 1 is great. My neoair sleep mat is great. Unfortunatly when used together they are slippier than a bag of eels, which is stopping me from getting any decent sleep as I slip around and end up in the wall of the tent every 5 mins.
Does anyone have any tips for none damaging ways to add some friction between the mat and the tent floor?