Here's how I have been packing.

Wadding first, pushed 8-10" down into the tube. Normally a BT-60 tube requires 7-8 squares of wadding, but the directions for the Vapor specify 8-9. The kevlar is then pushed into the tube (about 8' of it as I recall), followed by most of the 1/4" shockcord.

The parachute is attached about 1/3rd of the length of the 1/4" shock cord down from the nose cone. The parachute is packed with the z-fold method (which has worked very well so far in about 20 launches), and inserted, then the last 1/3rd of the 1/4" shockcord is put in the tube.

I've prepped a fair number of rockets using this method and haven't had any issues until I was flying the Vapor.

Having run some Rocksims of the Vapor on C11-3s, I am starting to see where the chute is popping just before apogee. I was under the impression that this was a good thing, but maybe the rocket is still moving and runs into the chute, hanging it up?