Spring swaps and o-rings are probably the best mods you can do to a steno keyboard.
O-rings are silicone/rubber dampeners that silence your switches on the bottom out.
You install these on your keycaps around the stem. It's recommended to use two layers of o-rings on OEM R3 keycaps (the keycaps that are on the Uni v3 by default).
You can buy o-rings for pretty cheap on Amazon by searching "keyboard o-rings".
Some mechanical keyboard enthusiasts don't like the mushy feel of o-rings, but the mushiness is great for steno because it softens the impact of hitting multiple keys and shortens the travel distance.
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