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Recoil Spring Weight for .40 P320???

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I was hoping to get some feedback on a good recoil spring weight for a .40 full-size p320. 

I recently purchased a full-size .40 slide from gunbroker and picked up a fat stainless guide rod so I could adjust the spring weight. 


I called Sig inquiring about the factory spring weight for the .40 and they said it was 20lb. so I played it safe and bought a 18.5lb 1911 spring. It works fine however I feel like I could go lower and would like the gun to shoot a bit flatter. A guy at a USPSA match last week said I could go to 15lb, but that seemed a bit low. 


I am aware the big factor with all of this is the ammo, so to keep it simple I shoot  factory Blazer 180gr Blazer FMJ and Hornady 125gr frangible.


Any ideas on how low I could with a recoil spring with this ammo? 


Thanks in advance

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