Not sure how much pull is on those cables.. but for the crimped ends on C/L lines I always took the free end (a bit longer than the loose ends seen..) and ran them around the tube sleeve and back through again before crimping. the effect is the wire almost has to break befre it can pull free of the crimped sleeve.
If you modify this approach a bit, you can actually have failsafe pull - pull cables. Take the free end, route it through the control horn again, and then through the crimp tube leaving a loose loop there. It's a redundant loop. This way, you have the "first" loop tight and doing all the work. Should that one get worn-thru on an edge, you still have some control with the second loop, albeit with a noticable change in trim. I started doing this after a pull-pull on elevator was cut through. A friend gave me this idear though.