I remember you wanting to hook up the second mag, but didn't realize you had Agentsmith.
How do you have it plumbed into the gun? Through the rear air?
Also, I really like your field box. I'd probably need two, one for the semi pistols and one for the sc guns, but it would lesson the trunk load and make me put more prep time in when I wasn't already at the field.
Have you tried a large dump pouch in front of your junk? I use the kind that are designed to be rolled up even though I always keep it open. If it's large enough, your thighs will not let it smack your junk and it distributes the weight of a bunch of mags well. Also it way better than a cup.