I take it you have the the current 3 piece spring design and not the early one piece firing pin spring where I gather the previous poster, remyltr, might have had issues with and was replaced with the 3 piece spring design. The new design was meant to solve binding issues when rotating the bolt handle.
The thickness of that washer between the two springs shouldn’t affect firing pin protrusion.
Can’t say what the thickness of that washer is, but I have past notes that the firing pin should protrude by .035”. You can make your own washer (brass) and make it an exact fit to the firing pin diameter.
Edited to add that the washer provides a better load bearing surface. If you wish to change the firing protrusion, you’d have to file or shim.