It's 25% of lost health for most armors, 50% for pain resistant armors, and 62.5% for pain immune armors. And excessive stun is the primary reason I'm carrying oxygen tanks along everywhere now.
I use those only underwater, heavy and backpack only for storage.
I'm using beer or canteens for that usually, rum and hi tech medkits later game, as they have stun remove too.
Once you get into later game and have decent armor reviving/preventing drop of gals that got wounded is quite worthwhile as they might get a lot of stun while at half or more health, and still quite combat capable.
Early game is fun, but helluva confusing. I'm still not sure what I'm doing, so I only got *the mutant alliance* at january 2602, and my mainstay weapon is military shotgun, because 45 damage ain't nothing to scoff at. I'm in general relying on shotguns, strangely enough: heavy shotgun, police shotgun, military shotgun. They have good accuracy at close-medium range, varied ammo and good damage output. I also got negative score at first two months, but I managed to recover from that thanks to two conveniently-landed freighters later on.
I like the new additions, especially the ever-familiar warp damage.
That's pretty slow. Reading or even better, knowing the tech tree from earlier playthroughs should help. One lesson that has really speeded up my equipment progress is learning from my first, gold playthrough about what research really matters or not, especially to not hog or rush research nice looted weapons in early game - use them against challenging opponents, research only if you have no ammo anyway. If you destroy the weapon in research and are left with few clips, they are useless. Use them first, then research, if you need the research more than others that is. This should allow you some early nice automatics, and those are better than shotguns on gals with good firing skill. In my new green playthrough i have a goddamn tommygun in first half of 2601, and the ammo for that can last a bit.
Contacts are also likely to be your main source of non looted weapons until you get a nice array of researched kustom weapons, and that's not going to happen until well into 2602, if not later, depending how economic your brainer use is and how man you have, so try to get research requirements for all the weapon related contacts you can.
Hunting rifles are the early game sniping weapon, wonder why wouldn't you use them.
Armor is a different story, you probably wantt to rush workshop and metal armor because tac vest's 20 side armor makes it very unreliable.