Logic behind light 3-bets

I want to ask a general question as I've started widening my 3-betting range at my local 1/3 and my winrate has gone up. Not sure if its just short term luck or some exploit. I wanted to ask the logic specifically on suited KX as I've been adding K9s-K6s and even K5s and K4s in as 3-bets pre.

Tendancies of my game:
1. people call too often pre and call 3-bets too much

2. people open too wide and cbet too wide

3. people use large sizing pre and post

4. people have no bet/fold button, if they open they'll often just go with it, even if they've only put in 40$ they'll put in the remaining 260$.

Observations: Its putting me in some wild spots postflop where I have gutshots, weak 1-pair and K-high FDs. Because Vs ranges are so wide, I don't often know where I am in the hand against their whole range. Like K7s on a K-8-4r, unlike AK where I'd be way ahead of almost all their range. This leads me to do more checking to get to showdown cheap.

Also wondering if K2s K3s are better 3-bets than K8s K7s because they unblock some middling hands V will call with like 77,88,78 etc.

HH for example. V is semi-competent loose passive that over values hands and value bets way too wide. A3o on a A-Q-7-7-T board is a three street value bet for him. Never folds AA no matter the runout.

---

H opens K♠ 6♠ from CO over 1 limp, V calls BTN, all else fold...not ideal.

Flop - Q♠ 8♦ 5♥

H cbets almost full pot, V calls

Turn - K♦

H barrells 3/4 pot getting a live vibe that V doesnt like this card, V calls saying "you're just gonna bluff off all your chips to me?"

River - 9♦

H jams for about 3/4 pot....