I like the check on the flop. Turn sizing could be a bit larger, but its fine. On the river just bet full pot and hope to get called by an 8 or K. I think the problem with overbetting is that sometimes people will actually fold an 8 here. The advantage of not overbetting is also the fact that you will sometimes get called by 2 pair or set.
One last thing: This is a microstakes MTT. This is really the wrong place to apply any GTO concepts or even think about balancing. Just play straight forward in the early stages.
In the mid- to late stages start stealing blinds more aggressively, C-bet and two barrel more often in good spots with reasonable made hands / draws.
Once you get shorter stacked, know your openshoving / reshoving ranges.
Finally, make no ICM punts once you reach the final table and wait for others to do stupid things