Up until I got serious about building a vehicle capable of 800 mph, I didn't give to much thought about parachutes except the standard stuff we use a Bonneville. A volunteer on my team came to us with load of credentials. He was on the recovery chute team for Apollo, Gemini and Mercury as well as the Venus probe. He also worked on several rocket sled projects with speeds over 1000 mph. He changed our approach to parachutes. On my lakester I now use a deployment bag to pull the lines out first, then the bag strips off and allows the chute to open. He has offered to provide some technical advice if you are interested.