Anyone switched from blue ox 1500 to 2000lb bars?

I have not switched, but it definitely sounds like you need to. I run 9 links. It seems like running 11 links would cause binding with the rotating latches during sharp turns.

They only make 2 hitch heads, and the difference is couple style, not capacity.

What is your tow vehicle? Make sure you aren't overloading the receiver. If the receiver is under rated, it'll twist rather than distribute tongue weight when you crank up the bars.