Why AK ammo and shotgun ammo DW?
IMO. As someone who's worn armor all day every day for over a year, carry as little as you can and achieve your goal.
Being fast and agile beats being armored against a hit.
I would say, you'd probably be faster, and better set if you had a "battle belt" with your IFAK, and all your med tools save the shears and a TQ outside.
That's how I like running my gear, gets me flatter, easier to don/doff, and better balance. Plus I have my ifak when I don't need my armor on.
"If there must be trouble, let it be in my day, that my children may have peace"