Nerf Triad spring upgrade?

Hey guys, new here. Been lurking and like this community.

I'm hoping you all can help me find/source a stronger upgraded spring for my Nerf Triad and Triad Elite XD (2 favorite blasters lol)

I've seen Orange mod springs thrown around a lot, but don't see anything on their site for the Triads.

First off, who all offers stiffer springs for the triad?
What is everyones preference?
If no triad specific springs, which upgraded springs from other nerfs will fit and add some power?

Already removed pegs completely and made piston seal tighter. Just need a stiffer spring.

Thanks everyone!