Don't know on Jeeps, but on a couple of my sports cars the rubber portions of the clutch lines, over time, can bulge under pressure or pressure and heat. I had one blow during a downshift and it cost me big to repair tranny. So they were all replaced with braided SS. Do the same thing with brake lines, tho I don't expect Jeep brakes will get as abused and hot as my cars. But again, I'm new.
I'd say if it gets softer the longer it's running, it's a rubber clutch hose bulging because of heat and pressure. Either way, good luck!
'06 Rubi Unlimited, bone stock...for now. 3" Zone lift waiting for time to install
'94 Mitsu VR4, highly modified twin turbo
'71 Stingray convertible, number matching & mint
"I'd rather laugh with the sinners, than cry with the saints..."