Pure druid HELP!!! I think I screwed up :(

[greyheartt]

I've run a full life on Druid and am unhappy with the results. Heroic levels were amazing, one shot call lightning on mobs and instantly wiping out any quests I ran. Epic levels have been disappointing and now that legendary is here. Its just not even worth playing druid accept maybe as a healer.
I went spell caster with my druid. But with all the buffs and crazy versatility that a druid has, I feel like I don't know how to use everything to my advantage and my play style is all whacked.
I've identified that there are two ways to play a druid. Either as a caster or a fighter. Either way you play, if you use a druid's fighter/spell abilities like slash or take down, wisdom is rolled in for the dc's of those and you make up for lack of strength with buffs. If your a spell caster, wisdom is still used for dc's. Over all it may be easier just to go the caster route.
The problem with a caster druid is spell power how ever. In epic levels call lightning doesn't do much to mobs on elite. It now takes too much to do a little damage. I have thunderforged weapons loaded with evocation and spell powers for each element. My DC's at 67 for evocation.
I'm thinking it's time to reincarnate. I'm doing a second life of pure druid. I've watched Gingerspice's vids on youtube but it didn't give me much incite into the matter. Checking the forums gave me limited ideas as well.
The way I've been playing has been versatile and I think it's limiting my potential.
Current stats are:
Str 37 Base: 15 +6tome
Dex 24 Base: 10 +3tome
Con 33 Base: 13 +4tome
Int 14 Base: 8 +3tome
Wis 60 Base: 25 +6tome
Cha 14 Base: 8 +3tome

LVL 30
Race Elf

Feats: Augment summoning, lesser and greater Evocation, improved crit(slashing), magical training, improved mental toughness
Epic feats: Epic cold spell power, Epic lightning spell power, Elusive target, Embolden spell, Epic Evocation

Enhancements are filled up to the fifth core and fifth tier in season's herald with 56 points spent in that tree.
Nature's warrior has 24 points spent in it's tree.

I'm thinking maybe it'd been better to go half-elf for the extra wisdom and I believe I'm seriously missing something. I feel like I'm spread too thin or something even after improving some gear and learning that evocation augments stack with everything. I like playing all four forms for the versatility but don't like how weak I am. I really want to do more damage. I don't know what to do to correct this for next life.

Any help would be greatly appreciated and if your on server Thelanis I will gladly pay you for it!
PLEASE HELP!!!