1/2 nl cash game
you are mid position with 99 it folds to you and you make it 12 to go the hi jack calls and the 2 blinds fold. You are now heads up both with stacks of about 250.
The FLOP is
Ks 6d 3c rainbow and you cbet 20 (is the cbet a mistake ?)....villain is a bit of a nit and makes it 40.
You should ?????

ok now same exact pre flop action as above vs same villian (who is a nit) both stacked at 250
You have pocket 88
FLOP Heads up its Kc 8h 7h....he called your pre flop raise of 12 now heads up you are out of position.
Do you slow roll or do you cbet ?

1. Call
2. Cbet

....and before you ask me WHY... I will ask you.... why do I suggest those actions?

I am not sure what King Spew is getting at...

1. Is a clear fold... you did say villain is a nit, right? You can only call this hand if you are willing to call down the whole way. Problem is he is never betting air here since there are no draws. Nines just aren't good enough against a nit's c-bet raising range, here. Only make this call if you have a good read on what his bluffing strategy is. (Hint: most nits don't have one)

2. Has to be a good sized c-bet. Have to deny all the drawing hands the odds to call and on top of it half the deck produces a turn card we don't want to see. Hell, if we gave villain too much credit in the last hand, then maybe he makes the same overplay here and we can happily get it in.

I am thinking because you call one bet looking for the 3rd 9 on the turn with the chance that if he checks the turn you get a free river card ?
I was also thinking that if you called his flop raise you pretty much have to fold to any aggression on the turn all while looking for a 2 outta on the turn.

on the second hand you are looking to block his flush draw with a cbet.
IF that is right ? your cbet has to be about 2x pot size no ?

@King Spew on the 2nd hand in addition to wanting to block his flush draw you are heavy favorite right now as you only loose to KK

he has an opened ended straight draw as well as the flush draw so I am thinking this cbet would have to be about 2x pot size

Lots of stuff going on here ...

Hand #1:
1) C-betting here is OK, you have 2nd pair (maybe) and hopefully Kx is in your range.
2) C-bet is too large IMO. One, why so much into this board? A Nit will fold to $10-15 here just as well as $20. On the flip side $10-15 is cheaper than $20 to find out you are behind ... which is what you are if this player calls or raises you 90% of the time.
3) You may be trying to apply set-mining thoughts to the Turn card, but you only get one card (not 3) ... and you aren't deep enough to justify a very marginal (2 outs) float here.

Hand 2:
1) You are not slow rolling, you would be slow playing if you choose to check/call here.
2) On this Board you should feel more free to c-bet (than Hand #1) since you can be doing so with a much wider range of hands ... Kx, flush and/or straight draws. It makes more sense that you would 'charge' an opponent to continue here.
3) I would be more apt to C-bet 'more' ($20 is fine) here since the Board is 'wetter'.

When you bet 'for value' you need to consider all the hands that may want to continue, not just the extreme cases. Every bet you make should help you narrow your opponents range of hands that they hold. Why would you want to place a bet (2x pot) where the only hands that will call (or just shove on you) put you into a 50-60% spot? Remember that your bet size also gives your opponent information as well. Would you bet 2x pot with KT in Hand 2? Why would you bet more with a dominating hand (set) than you would with TPWK? (Top Pair Weak Kicker)

Your bet in Hand #1, unless it's a bet you always make, actually looks weak to me and I might consider playing back at you at times. A 'smart' Nit may feel that you will shut down on the Turn with this Board so he's trying to get some of his value now. (Remember that Nit's have suck-out fear just the same as you do.)

I think it's good that you recognize that these two hands are different, but you may be focusing too much on your cards and not the whole picture. GL

I didn't look at the hands tbh. I was simply trying to drive out your thought process before being spoonfeed.