I was planning on using 6g as my backup charges. I'm going to start ejection testing at 4.5g. I have decided on 4 4-40 pins in the nosecone and 2 4-40 pins in the drogue. The latter is still slightly up in the air, but I like the large margin 4-40 pins give.
I will drill 2 1/8" holes on opposite sides and ends of each parachute bay just clear of the couplers to provide pressure relief from altitude change.
I will do ejection testing next week!
I've got the Performer 150 from Ken Allen which is almost the same thing. The booster is 60" and the payload 48". I'm using 4g FFFFg for the drogue charges and 5g for the main. One gram larger on each of the backups. As long as it opens the drogue will pull everything out on the way down. I use a pilot chute on the nose cone to pull the D-bag and main out. All I need for main ejection is a couple of feet of separation so the pilot catches air. I use 4 4-40 nylon screws as shear pins on the nose cone, but only two on the booster.
BTW, I bought one of these swivels because my drogue shock cord was so twisted up from the spinning fin can on the drop to main deploy that the drogue was twisted in it and not doing anything. This on the fin can, and no problems.