Should be a cromoto on the Salsa, I’d have thought? Lovely forks for rigid, definitely on the comfy end of the scale. Think you’re into truss, Lauf and bouncier if it’s it’s not comfy enough.
But you can also try carbon or Ti bars, ESI grips… Bars with more backsweep can allow you to relax your arms and transmit less to your shoulders.
And/or big front tyre. I’ve got a 3.0 knard on a Hugo in my cromoto (26er)
Before all that though, just ride it lots. takes a bit of relearning if you’ve not ridden rigid forks for a while. You need to stay lower on the bike, arms more bent, so you can extend into dips and off small drops, let the front wheel drop and keep your body steady. That was the biggest learning point for me, anyway, and probably what I should have been doing with boingy forks.