Trans line mods

[Barnfind46]

Hey all.
I cut my metal trans lines to add an additional cooler. the bottom line now runs fluid through the new cooler and then it runs through the radiator as always. I put double hose clamps on the rubber line but this morning it blew the hose off. I was pulling into the shop so I caught it before any damage. Is there a way to add a bulge or swell to the metal line so the hose and clamp will not slide off? The truck has been driven three thousand miles after the install. I could reinstall it like it was but I will worry about it. What would you guys do?