Sounds pretty nice – I have a Summer Breeze from Tewa and have been good down into the 30's (and mine isn't overstuffed), but I'm a warm sleeper.
What length is your Streamliner SL? My current favorite hammock is a Weight Weenie Micro from Butt in a Sling (BIAS) Hammocks. I had to put 12" extensions on my Summer Breeze to allow it to hang in the center of the 11' hammock.
I'm thinking another Tewa UQ is in my future for colder temps…