Don't you just hate trying to go out and find deepslate, and cobbled deepslate
Well have I got the thing for you?
This is a simple crafttweaker scripts, which changes your vanilla cobble/stone gen, to produce the deepslate versions when you build it below a particular Y level (default 0, configurable)
with 1.1.0, if Water and Lava meet over Sandstone, instead you'll get Tuff
Feel free to use this in any and all modpacks
Works for Forge and Neoforge.
Won't do anything for Fabric or Quilt
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Updated to be a couple of CraftTweaker scripts now, simply grab these scripts and put them in your scripts folder

