There's no way you'll be able to keep up with the Level requirements of the Epic Quest line by only running Epic Quests. The fact that there are 4 (3.5?) Epic Prolog quest lines may have helped until now, but once you're into Book 1 you just won't keep up. Questing & Skirmishes are probably your best source of experience & gear. Crafting can help. Slayer deeds will certainly give you some XP from the mindless killing, but it should get old fast.
Don't bother with *all* the quests. In some zones I leave after I complete all of it's quest Deeds. In others I stick around for reputation. Find your balance, but you will need to find *a* balance.
Congratulations on that Deed! You found a Nickel! Wanna go to the store & spend it now?