I would recommend the JC Hiflow. I paint a lot of bodies and that one seems to be one of the best for longevity. It does have a ton of vents and most of them have a good bevel around them so the body stays fairly sturdy.

I havent seen very good results from the TLR body. The lexan just seems brittle.

Cutting round vent holes does really help too. If you do want to cut the shaped holes out, use a dremel with a 1/4" carbide cutter. They cut really clean and the corners are round.

Also the jumping attitude is a big part of parachuting. Keeping the nose down so the air cant get under the body is probably 3/4 of the solution.