If its anything, it would be the mainspring. a lighter hammer moves faster and should actually impart more energy to the primer all things being equal.
I had issues with a batch of RWS frangible non-toxic ammo in my old 92G. Had failures to ignite with both a “D” spring and a stock spring. Other than that specific lot, I’ve had great luck with RWS in 9, .40, and .45.
OP, this thread may be of use. I had similar issues. Many suggested cleaning the firing pin channel.
https://www.m4carbine.net/showthread.php?163998-Beretta-92-series-light-strikes/page2