I did a retro fit deps in my 3 before nats this year and had the same problems with the teflon sheathing from cst. It was binding very badly.

If you have the ladder system built you really don't need the teflon sheathing. So I yanked it out and rebuilt it with the standard stock-kit sheathing.

I'm not sure if it's because when you get the cst teflon sheathing it's coiled and it's impossible to straighten it thus making it bind or if there are some issues with the ID of the teflon sheathing that's making it too tight. One thing you could tray is sanding the carbon rods slightly.

on an older batch of the teflon sheathing I didn't have the binding problem. I think I am going to stick with the stock tubes from now on out....

It's not that big of a deal to yank the whole thing out and rebuild it, although it might take a while....

good luck!