Yes bump steer.
Crossover steering was not intended to deal with the height you have on the springs. The angle of the
drag link is what will cause your rig to have bump steer. Your roll center is somewhere near your spring
eye level, and the center of the panhard bar is well below that.
Test: With no shocks on, (easy at this stage...) bounce on the front bumper/frame. Watch your steering
wheel it will be rotating as you bounce, or "bump". Also watch the tires they will probably be moving side
to side unless you have a serious steering damper on.
On the other hand, I'm not too sure how much travel you are going to get with those springs arched like
that, with the very short front shackles and the static angle they have. That thing will propably not
bounce too much no matter how you jump on the front of it.
If its only for shows, anything can work, just don't try to demonstrate "what it will do" unless you have
a death wish.