Much better results last night! Temp was only in the mid to upper 30s, but wind was howling and steady downpour of rain most of the night.
The Hex fly kept me and hammock completely dry - no rain infiltration problems.
Use of the thinner SB sheet as opposed to the SB "quilt" the night before must have helped keep the OCF pad against my body - could tell a noticeable difference in underside warmth. Thanks BB for this suggestion. I had a very slight cold spot in butt and feet areas but not uncomfortable - just noticeable.
Adding a stocking cap on my head made a huge difference as well - won't forget that again.
Next biggest challenge is learning to tie the fly down effectively in high winds. I thought I had taken the tarp edges "to ground" with only about 8 to 12 inches of tie down cord between ground stake and tarp edge. But either the wind shifted, or the tarp/suspension stretched with rain, and I got an annoying tarp flap and a LOT of wind coming across my face. Would it have been better to just stake the tarp corners direct to the ground (i.e., no cord) to ensure no wind got under the tarp? Or does the tarp need the tie down cords as "shock abosrobers"?
I did notice that you can lay in a warm hammock a LONG time tyring to decide whether a tarp flap is annoying enough to get out in the cold and fix it - or just put up with it.
All said, night #2 was better than night #1 - still have some tweaking to do and a lot to learn, but enjoying this. Thanks for all that share experience and lessons learned!