Calculating total capacitance

I would be very grateful if someone could provide me with the final cap pf rating when using the Rega P9(supplied rca cables-70pf?)and the Rega Exact 2 MM cartridge,the cap of which I have not been able to find.

I have a Steelhead phono which I would really like to dial in to the above combo.

So far I've done a lot of experimenting,and I am looking for some consensus.

So fellow Steelheads,if you have used your phono with a Rega set up like mine, what cap setting did you prefer or would you suggest?

At present I am using 55 db gain, 47K, and the default 150pf.

All opinions would be valued and appreciated.