You use a +5 energy katana or the FFS with a +18-20% enchantment duration mod. Serpent's Quickness + Spellbreaker should once again allow SB cycles to overlap so that you have enough time to break aggro and find a safezone to rest in until SB + Serpent's is recharged. If you need a running skill I would likely substitute Blessed Signet for Storm Chaser (If you're running through places with a lot of elemental damage, you'll be gaining ~4-5 energy when you're hit, *and* you get a nice speed boost to break aggro).
EDIT: Have you checked to see if things in Dragon's Gullet use Rend Enchantments or Shatter Enchantment?