[StellarWind]

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The second thing I do is to check the turn the next time I have a decent made hand (even if it is slightly vunerable) and then raise the river when they bet (this tends to slow them more than if you just call)

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This is very bad advice. Villain is bluffing the river 100% of the time. This is a very serious error on his part. You do not want to "slow" him because that would greatly improve his play. You want to encourage him to keep doing it.

The correct way to handle the river is call with every hand that can beat a substantial part of his range. PokerStove says OP's actual hand can only beat 25% of random hands on the river. At 4-1 pot odds that makes it a marginal call, depending on which hands you think are too good or too bad to play this way. But certainly it's an easy call with K8.

Moving back to the turn there are 3 BB in the pot. OP doesn't really say how Villain handles turns but I'll assume he calls a lot, folds a lot too, and checkraises sometimes. You should be betting good hands for value, semibluffing some hands that have no showdown value, and checking in between hands like Ax.

The plan with the in between hands is to win a bet on the river by catching a bluff. Consider cases:

1. Ax is losing. Certainly checking is better than betting the turn. Losing a bet on the river and not risking being checkraised off your outs is the best you can hope for.

2. Ax is winning and he would fold the turn. It's +EV to win a bet on the river even though you sometimes lose to his 3-6 outer. The pot is small.

3. Ax is winning and he would call the turn. Catching a bluff on the river is just as profitable as the free showdown play. This play saves a bet when he makes his hand on the river. It also avoids all issues related to bluff turn checkraises and bluff river donks.

Moving back to the flop, if Villain calls the flop with any two and then gives you a free look at the river, how bad can betting Q8 overcards be? If your pot equity is really terrible you could take the free card, but in that case you should be done unless you improve. There is no reason to push 87 unimproved versus someone who never folds.

Moving back to the preflop, against a terrible postflop player you should usually play more hands not less*. Calling this flop with T7 is a really bad play and it makes me want to play hands like J9o more often, not less. You are going to clean up when you pair the flop, get cheap cards when you don't, and get great implied odds when you improve courtesy of his bluff fetish.

What more do you want out of this?

* There is a caveat to the idea of playing more hands versus a terrible postflop player. His play needs to be terrible in the context of your current hand. Overaggressive play is bad because it loses too much to good hands, but it's a great way to play against a J9o steal because he'll just sweep you off every flop you miss, charge you the max for your draws, and win some of the rest of the time too.