I think that both Tactics and Agility should affect the chance that the enemy won't be able to hit you. Something like Tactics*2 + Agility. Surely you can't dodge a bullet, but if you are running faster and can jump some obstacles, then you are harder to hit and can find better place to take cover. If you find some nice corner to hide and shoot, it also matters how fast you can get there.
I like the fact that combat is hard. That way you are forced to avoid alarming Conservatives as long as you can. And when you really need to fight, then... remember that you have an unlimited source of bullet fodder gang members you can recruit. Also getting better weapons is not much a problem if you have a professional thief to bring money. I have just cleared Intelligence HQ out of every piece of equipment, without causing an alarm. 16 computers and some other stuff = 4000+$ from one raid. I am playing 3.16.2 version, but it should work in 3.17.0 too, since nothing changed in that topic. Destroying doors create more suspicion now, but I never do it. With security 7+ you can unlock any door.