[Higgins]

I'm currently looking at a 48' run of 5/16 running approx 8#'s
With a vertical lift of 4' for 2#'s
In order for me to get to 22#'s I need approx 4.5' of 3/16 choke.
Where in the run should I add this. I hear it's better to choke the tap end instead of the keg end but how would one keep this extra five feet cold?
Should I reduce my 48' trunk to 44' or so, tie in the 3/16 and rewrap the lot with the glycol runs? If so what's a good method to make your own trunk line as this would be what I'd be doing.

Off topic anyone have any opinions on the ****** faucets. They don't have the same cold block technology as I'd like but they cold line them to the faucet with copper and tie right on to a copper plate. Wondering if this is a close second or not.

Lastly what's preferred vinyl, poly or barrier line?
What's the main difference between them and how do you tell what's what?

Thanks