Thanks for the replies.
Presently I nest the mummy bag into the syn bag . I am very, very constricted and the twisting it takes to get in both bags and then get them both fully zipped is a PITA. That is what I am trying to fix.
Based on what you wrote, I think what what I need to do is start saving up for a minus 20 deg F sleeping bag.
Under me I know I am all set, I layer the HR and ORM together with a z-rest and BA aircore in the pad sleeve. I put my puffy jacket at the foot end and use the partially attached bug netting to keep the puffy jacket from being kicked out.
BTW, I have thought of making some type of shockcord at the two connections along the quilts edges. Something that unhooks easily since I would want at least one shockcords open to get into the hammock.
Love my JRB BMB