ive been dynoing with a 020 bridgestone for 4 years,you cant kill them,try 40psi,
then try 25psi once its warm and keep and eye on the peak torque number.you might find it picks up torque at 25psi as it doesnt spin at peak torque.depends if
your shinko was hot or not,ive seen 10hp from a track tyre chunked to the 020
bridgestone.