+1 on the blue pad/ reflectix under your feet, whether in between a dbl layer, inside the hammock on a single layer, or even inside your footbox/sleeping bag.
The small chemical handwarmer packs work great too for generating heat if there are blood circulation problems involved. Toss one in by your feet and they will be toasty all night.
Personally I found my biggest issue with my UQ on a gathered end hammock was the "ridge" that runs through the center when loaded caused a small gap between the hammock and UQ on the foot end under my calves. That small gap lets a lot of cool air pool under my backside causing major CBS. On my last trip at ~ 28 degrees F I used a spare sock to plug the gap. I'll probably add a draft tube to the foot end of the UQ to alleviate this.
Experience is the worst teacher - it presents the exam first and the lesson later. - Unknown