Springs testing!

450 are a bit too stiff at the front. It was bouncy on the track, I'm sure it wouldn't work well on the streets here.
350 at the rear are surprisingly good! For my build. It felt comfortable.

My guess is:

350 to 400 front
350 to 450 rear

I'm gonna buy Tom's 400s, if they are still available and try them at the front. They could also be used at the back, I think so.