Simple, don't jump, it's not beneficial in any way. I know you have to in order to get out of the flag-pits in NW though, I find the best thing to do is single jump while close to the wall for as little air time as usual, since if you're caught in mid-air by a freeze/stun you're screwed (unless you got a puri wep, or an ep focusing you), if it's especially crowded you would want to anti-stun and to not be close to a wb, other than that don't jump at all, it does nothing good for you