I ended up splitting the difference in length and going 66 in, and stuck with 10 ft. My grand trunk is 10ft and 60 in and i think the little extra room will do me just fine. I sleep great in the 10 ft too so I think the length will be good. I think that it will save a little on weight, but also more versatility in hanging (which I don't see a ton of trouble finding the right distance trees but I just like the idea).
I was considering the hh hex 70d tarp. Any input? Gets good reviews, biggest complaint is weight/bulk. I like the idea of the cost and seems to perform well in heavy rain. thanks again guys!