How are you going to compensate for the extra pressure drop to maintain design pressure at the big end and main bearings?
The relief valve is designed to prevent over pressure mainly with over reving, when cold ...it does not regulate oil pressure at all when the engine is warm generally as this creates additional heat thus wasted power dumping over the relief. The oil filters aren't inline they are connected in parallel , the oil velocity across them is halved , losses 1/4..additional losses with be incurred due to length of hoses and fittings...these are dependent on dia and viscosity..or shear rates
Going with twin filters as an enhancement to improve engine life and with 3/4"UNF thread a greater range of filters with different specs
Maybe as you mentioned your issues were more to do with oil pressure fluctuation resulting from surge
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