Rab - Hypersphere 9.5 Down Sleep Mat

I don't race and honestly my light setup is probably significantly heavier than what you have. But i do appreciate Arkansas bikepacking and bikepack racing. The riding is hard and fun and your rig is sweet! Imo, if your going to mess with an airpad make sure you get a warm one. As far as setup and breakdown, they are a pain because you need to get all the air out to pack them snug. Even a tiny bit of air makes a pad a bulky mess. I personally love rab pads. Currently my winter pad is the hypersphere. It's ridiculously warm (someone talked about heat radiating, this one does that) it's quiet, and it's heavy. But only a little heavier (and similarly bulky) than my cheap Klymit I use for summer. I'll probably invest in a ultralight air pad at some point for summer but winter isn't the place to cut ground insulation corners. A cheaper rab is the stratosphere at r5. 5, which stacked with your foamy should get you to R6 (your foamy is half length and narrow so you won't get the full +R2 boost. Imo, if you are going airpad go warm. If not just get a full size foamie. The durability and lack of hassle of a foamy is going to be superior to any airpad. Finally, I do recommend a battery pump. The stuff sack inflation takes forever and some pads are prone to delamination from moisture from breath. And in my case the rab is down filled.