Great comparison Data!

Can you tell me something though......?
How are you securing your tubing to the Copper 90* and your Copper Y? I mean there is no barb.... are you putting silicone on the copper tube and the sliding your Tubing over it then worm drive clamping?
I would be scared as hell that my RD-30 would jettison my tubing off of the copper 90*. I actually thought about copper fittings and tube runs in my box - but shyed away from it - but with your 90* data... I might introduce it back into my loop - if I can figure out how you are attaching your tubing.
Thanks