This is probably something that can be handled with some joint controled smoothing rather than a joint adjustment.

 

"...using a hip rotation and then adjusting the thigh and shin worked better..."

I tried that, but I still need to bend the thighs more than 45 degrees...again, I find the crease starts to show up at any bend beyond about 40 degrees.

I'd rather stay in my lane than lay in my stain!