I agree that the blow test is a good place to start. I would do it on a rocket you have flown if you have never tried it before. Prep the rocket with its regular parachute and wadding (or whatever you use). Pack th echute the way you normally do. Then blow from the end where the motor goes. The chute should eject like it normally does. Now you have an idea of how hard to blow. Now try it with your rocket with the baffles. If you have to blow a lot harder you might have a problem.
NAR# 92125 L1
Total Impulse for 2011: 1,729 N/s
Total Impulse for 2012: 1,689 N/s
Total Impulse for 2013: 795 N/s
A:6, B:5, C:19 D:15, E:4 F:0, G:0, H:1, I:0