I have an MPR rocket: 4 x 58 inches, final wt will be ~ or < 3#, will fly on a G motor, 36 in chute. What is the best shock cord? Kevlar? Nylon Elastic? Other? How you would mount it? If the length = 3x the rockets length (I have seen that general rule somewhere), is that really enough? Pros & Cons of your choices? I know, lots of questions but like everyone, I don't want to zipper or crash this rocket I am putting lots of time and effort into.