I agree, if reversed, it would work better
Amsteel continuous loop and strap.
If you want to try again with your current rigging...
After you tie becket hitch. Add a slip knot about an inch from becket hitch exit.
Slip knot is tied on side of bunny rabbit ear that does not initially move when ripcord
is pulled. This would be as soon as becket is exited.

A slip knot can be added at the exit of a great many knots and splices,
to prevent failure—slipping! The slip knot when called upon by slipping,
bumps into the knot but usually can’t be pulled through bury or knot!
Kinda puts the brakes on things.