Live 25-50, utg raise to 200, I call AcQh on the button, sb calls, bb calls. I have 6k and the sb covers.

Flop: KsQcJd

Checked to me and I check.

Turn:4s

Checked to me, I bet 450, sb checkraises to 1850 and I call.

River:6h

He shoves.

Sb is a pro from Macau, seems to be a pretty big winner in the PLO but has been pretty tight and straight forward over a few NL sessions. I'm assuming he's capable although I 'd guess he slightly unbalanced towards value in these spots. Is flop check a mistake? How about turn sizing? Not sure about the river, feels like I'm really capped, do I need to call this off?