This is a big question in terms of armor and weapons. Or a few questions, rather.
Question 1:
Should I upgrade my Ash Tail Coat to a Vog Cub or a Skolver? If neither, which armor should I switch to?
Question 2:
Should I stay with Silent Nightblade and upgrade it to Acheron, or switch to a Divine Avenger/Gran Faust?
Question 3:
Should I upgrade my Graviton Charge, or switch to a different bomb?
Thanks for your time!
Both Vog Cub and Skolver are good for swordsmen. My recommendation is that you upgrade one of your pieces to Vog Cub, to get some elemental protection, and then upgrade your other piece to Skolver. Then make another two pieces, to get a complete Vog Cub set and a complete Skolver set.
I prefer Acheron over Gran Faust, although both are awesome. There are many threads on the forums discussing their relative merits, so search if you want to know more. They are not comparable to Divine Avenger, because that does a different kind of damage.
People seem to prefer Electron Vortex over Graviton Vortex slightly, but it's harder to get, and the general wisdom is that if you already have Graviton Vortex then it's not worth it to get Electron Vortex. Then again, if you don't have Graviton Vortex yet, then consider switching. If you're talking about entirely different bombs, then the popular ones are Shivermist Buster, Nitronome, Ash of Agni, Dark Briar Barrage, and Radiant Sun Shards. Read the Bomber Guide on the wiki.