I have recently been through the fabric choice torment too. I had originally decided on M50 all round for my HG quilts with perhaps an M90T inner on the TQ for a better feel, but after a good honest call to Adam I went for the 1.1
I'm a relative newcomer to hammocks and this was to be my first proper set of quilts. I was easily tempted by the talk of UL fabrics on HF, but there are always compromises to be made and cost quickly rise.
I also didn't have the opportunity to get a feel for the fabrics before I ordered but I trusted Adams advice and am very glad I did. The 1.1 feels lighter than I had expected and I wouldn't want anything less durable.
If you are really counting the ounces, go for it, there are some considerable weight savings to be made, but don't discount the 1.1 fabric. There must be hundreds of 1.1 HG quilts on the trails without any complaints from their toasty owners.