For this dicussion i would like to assume there is only one villian and both of u have 100BB in a 6-handed game (everyone else folds)

Situation 1:

CO raises 3.5
Hero KAs/KAo raises 12
CO raises 36
Hero ??

This is a very common situation i find myself in. From what i know, shoving here to maximize fold equity from a race is the most common play. However, i always find that the villian will have QQ, KK, AA or KA if he calls my shove. Im a slight underdog against QQ, draw with KA and a big dog against KK or AA. Even if my opponent is loose, he might call me with JJ. Wouldnt this turn my hand into a bluff? since i dont beat any hand in his calling range?

Situation 2:

Hero raises 3.5
CO raises 12
Hero raises 36
CO raises 60
Hero ??

A min 5-bet? what do i do here? its always so tempting to shove, but i have zero fold equity since he already invested 60% of his stack. What is the optimum play ere? shove or fold? Calling is just retarded since we have 40 more and the pot will be 121.5 on the flop.

Situation 3:

Hero raises 3.5
CO raises 12
Hero raises 36
CO calls

Now the pot is 73.5 and i have 67BB left. Its obvious im shoving and monster draw or pair, but what if i miss?

a) small flop 245, 225, 589
b) mix flop Q42, J95
c) big flop JQ2, 10J6, 8910

to shove or check fold? Reminder, if u shove and get call..u are ALWAYS behind..

Situation 4:

CO raises to 3.5
Hero KhAh raises to 12
CO raies to 28
Hero ??

Pot = 41.5 and u have 88BB left. Not comitted to the pot yet, shove or call or fold? Its almost too tight to fold here i think? Shoving here would make my hand like situation 1. I dont think a regular tag is going to call ur over shove with QA here, so its either a race or dominate. If u are dominated, it means u have fallen for his small 4-bet trap to get u all in. Say just cold call, trying not to build the pot with KA high. The pot is now 57.5 and we have 72BB left.

a) Assume the villian bets half pot 100% of the time regardless of the flop texture, what kinda flop are we looking for to move all in?
b) If we flop a K and villian more all in OOP. Must we call?

Thanks for ur opinion in advance