I would just cut everything below 5'. I believe pruning pears is a loosing effort and not really beneficial. I could be wrong as I read about them when I planted mine. That was 5 years ago and they are still the same height.
Never been able to prune pears and anything change. If you cut off crossing branches, etc, they'll just replace them with four more. I don't even bother.
My 2 cents I would cut those outside branches on tree 2 to about 1/2 their length, they could use some diameter to carry fruit. Also the tree with the double central leader I would likely reduce to one. I really like the looks of tree #1. What variety is tree #1?
The one I planted last year was top cut from lowes. Has several leaders but sounds like it may not be worth the effort to try and prune it up.