I recently bought an SCT X3 tuner for my P71, and have the spark timing/global spark set to 10 degrees over stock, my custom tuner says I'll start to loose power if I go any higher. I have MSD Ignition coil packs and I've seen MSD Ignition control modules capable of advancing spark timing up to 20 degrees over stock. What is the very highest I can go with 19lb injectors, stock fuel pump, and assuming I can keep engine temp at ~168F?