I have the same hammock but mine is a DL. I am 6ft 2 and I weight 275+. I have not had any of the issues you have reported and I have used several different UQs with mine.

I recently got a SL Netty and have not had any problems with it either.

If you find that the problem is too much stretch in the fabric then look at a BB 1.7 DL in either the regular BB or the XLC ( I own and use a 1.1 DL, 1.7 DL and a DL Multicam BB )