Something else to consider, and this is a lot to think about, I am aware of this, but I know you can handle it if you think it through...
I have a rhetorical question about the composition of your categories...
If the turn is a heart, and all of your c3 hands are flush draws, then what are you bluffing the turn with on a turned heart?
Please don't get tricked here, it isn't that hard, if you don't see the answer already, go back and think about all of the hands you get to the turn with - not just the c3 hands.
On each street, every hand in the range gets re-categorized. Hands that are c1 on this flop, or c2 on this flop, they might become c3 on some turns. And vice versa as well. It is also possible, though less likely, that c4 hands can come back to life on certain turns if and when villain checks behind on the flop.
Just making sure that you understand how wildly these categories might change from street to street on certain cards. This potential is usually noted as a board being "static" or "dynamic". Static boards don't change much, dynamic boards are likely to change.
This board is dynamic as the top end hands are going to change on most turn cards.
For example, your c1 AJo hands suck when any heart comes, any Q, any K, maybe any 9 or any T, or any 3 or any 8. There isn't much left that can come, unless the turn is an offsuit J or an offsuit A, the value of AJo is going to be heavily reduced, especially if it faces a raise on the turn after any of those cards.
However a hand like say AhJx has potential to be used as a bluff on those really bad runouts. It blocks the nut flush when any heart turns, and it draws to the nut flush as well. Plus the J blocks a ton of villains JT, J9, QJ, KJ type hands that stand to have improved when the board runs out scary. Picture villain holding QJ, turning an offsuit Q, and then having the 9h come on the river. You can ship that river with a great deal of confidence that you have significant fold equity on a flushed board that also contains 4 to a straight. The AhJx blocks everything as well as you could hope for. Yes, it might have some showdown equity, but oop on the river, making villain fold a hand you beat pays exactly the same as if the hand were checked down and it prevents villain from ever bluffing you with a worse hand on a scary board.
Note that I am not saying to start turning AJo into a river bluff all the time here. It is a very specific instance where this might be the best option. Usually we will be playing defensively oop, just trying to get to showdown. But on occasion, a dynamic board, and a scary run out provides opportunity to get a little creative with your thought process. Since we play micro stakes and nano stakes, it is also worth mentioning that even in that perfect scenario I described above, there is a decent probability that villain isn't going to fold QJ no matter what, in which case bluffing is futile, even if your hand is the perfect bluffing hand.
There are a ton of factors to this scenario, I'm just trying to make sure you understand how drastically things can change on these types of boards. Which is why I chose these types of boards. Static boards are much easier to deal with. If you can handle the thought process of dynamic boards, then static boards will bore you. I mean fuck, when the flop is QQ3 rainbow, and the shit starts hitting the fan, you either have a fucking queen (or better), or you don't, it's really that simple.