Note that 8
7
is the nuts and fits the rundown read, and might well be played this way. Also most good rundowns made a FH.
Also note that villain has 400bb, so we should have some idea how he's playing. I also wouldn't assume he plays the same way as population given stack size.
In a void going for thin value with reads you won't get bluffed is fine, but if people take notes it can go bad esp. given a 1/2 pot bet on river looks a lot like a good flush.