you should never run the tires at max pressure. unless you are towing
or have loaded up like a pack animal you should run at 38 to 40 psi
in those tires.on the eagle i run my tires at 32 psi. the max pressure is 35
psi. the my dad has a 2004 grand cherokee with pirelli scorpions
235/75-15's the max pressure is 44psi and he runs 40psi cold 30psi for
snow,mud,and ice. as far as the steering problems, go back thru the list of work you had done and check everything. you may have missed something.
good luck, rollen