The thing is he ties with a big portion of your value range as well as beats stone cold bluffs.
When you bet 51k on the river, your betting into a pot of 86k (assuming the table is 8 handed), therefore in order for his call to be correct he doesn't need to right that often. For this reason I think its better to do what Dave said and jam river > betting 51k. Tournament life in is huge in spots like this, especially when a lot of the time your opponent knows they will be calling off to chop at best.
Personally however, I'd be giving up turn. Seems a bad card to bluff as he's most likely not folding Qx / never folding Ax. If we do bet the turn then we have basically committed ourselves to barrelling river seeing as hes rarely to never gonna be folding turn. If we check turn back, we have 3 clean outs to the nuts and one 'dirty' out. If we ping one of these 4 outs then its fairly likely we get small value from all of his Ax / Jx range.
i agree with this and give up on turn vs most, although vs some players online i will fire another small turn bet as there is obviously a % of regs who will float A2C on flop waiting for you to slowdown so they can put a steal in. 2 barrels is minimum/mandatory in any pot vs these guys once this is noted.
bet/bet/jam line is fine but overly aggro for me 99% of the time. definitely jam if betting river.