Great stuff Dep!
I'd like to add my own 2 cents about some gear choices. I only really play casts so can't comment on the other builds.
D Virus Launcher (set) is a great option for rangers rather than just Dark, if possible.
Behemoth Armor is still a good option for RAcaseal as it has better EVP than D virus. I prefer running Behemoth + High EVP RR as I'm normally on low HP from using D Virus Launcher + Final Egg Blaster. I survive a lot longer than I do on RAcaseal than on RAcast because of the EVP. Behemoth + RR have great other stats too.
From my experience Eternal Night isn't great on HUcast. I found even with 80 hit it didn't connect as often as I thought it would, and it doesn't build PB from using the special attack. It seems to work better on HUcaseal with the better ata, and animation.
Ill Gill Reaper's hell is better than Mitsunari's for EP4 Lizards I believe.
Combustion Cannon set isn't needed IMO.
Can confirm arrest supressed gun works great on Hucast / Hucaseal! Though that type gu/mechgun has better ata by a couple of points.
Whilst Hell Yas 7k has better ata, Hell striker is sometimes better due to greater range.
Stealth suit has better EVP than spectral suit, so is still worth considering over spectral suit for the lag free weapon changing effect.
Would be great to hear others thoughts!