what would be the best pressure to run that size of tyre at a drag strip ?

i have done all my road testing at 30 psi all round as i thought with the tyres being so shallow i couldnt drop the pressure ?

 

Because you have such a low side wall profile i do not think you would even really notice a difference by lowering the pressures.
Could always try lowering by 5 psi at a time and seeing the difference it makes if any