River is really interesting and his betsizing completely polarizes him i agree. His turn bet seems strong, but there doesn't seem to be many combinations he's repping there that then correspond with this play by him on the river card imo. With the pretty in depth read that you have described, the best play has to be to bluff, and i would go for the click back over the shove as the most efficient way to do so. This should be an air/nuts situation for him and given that he can't hand read we aren't hopefully going to get rebluffed, and i reckon he'd be bluffing enough of the time here. Live players are prone to more than the occasional spaz even if he hasn't gotten much out of line vs you so far and it's something worth taking into account in this spot.
totally agree with all of this.
wish I'd made it £590 and watched him snap folded the 78 that he had so much pleasure in revealing after I wimped out and folded...