same as Vyvanne , you're behind schedule . go back to terror and farm those shrines you need ,then go back to destruction . get the 1% increased ctb shield asap , you only need 2265 dexterity with it on for reaching max block . switch to bear stance when necessary
, as it provides more than enough defense along with Spirit Guide , just as the miniguide says
you got the 1-pointer stormblast there too . try that vs single targets . some of those single targets also got a chance to avoid hits , so it only seams that you're not dealing enough damage while actually your hits are being avoided ...
you gain enough damage from Crane stance , Spirit guide (when the wolves are around) , MOTW + Shamanic Trance
colosseum has a low chance to spawn , so keep crafting
. almost as rare as the Javelin Nova proc on the armor
since the colosseum weapon is just a switch gear you want for the oskill , any shrine goes well there for crafting, the other affixes on the weapon are not important . you use Colosseum to jump to a new pack , and that's the only thing you do with that switch weapon , then switch back to the main crane stance setup
good luck !