Dont no what size u've got but mine are 235 35 19, i run 32psi all round and seems ok.
I dint realise they where recomended to be between 40 and 50, this seems a bit high/hard, should imagine the ride would be really hard and bumpy.
Just a case of trying it i suppose, any size 17,18,19 personally i would put 32psi. But would like to hear if people do different.