I've been posted about this exact issue here:
Short version. You need a extra power hammer sprint AND a firing pin that extends further out than the stock firing pin. The ar15 "enhanced" x39 firing pins are around 0.041". I bought a steel firing pin on gunbroker years ago and machined it so it extended further. That plus the Wolff extra power hammer spring gave me reliable ignition on all ammo. I'm trying to find a source of steel firing pins now with no success.