You are trying to put agility dhans into the burst damage role which str avengers already are good at. Agility dhans and dex guards are all about racking up crits with the accumulation buff (OS or SA)
and @bloodyblaze: Psy wizzies are a whole other topic (since mages should deal burst damage but none of them can with our gear) however dex guardians are amazing and I encountered one after the server merge.
1: Dex is the 2nd highest stat buff in the game (vit is the new king with lumir's help)
2: Dex guards get to use a shield (gives you an extra stun as well as block rate from bless shield.
3: As a dex guard you can take advantage of twin aura all stat rings +18 and 2 ruler +18 to get the perfect balance of all stats and attack force
A good dex guard with the gear we have today will be able to fully mana drain you and chain stun you almost forever with 7k-8k dex dont tell me thats not a stone cold killer.
If you have the PH set you can throw 500 dex away and use a 4 pt OLD dagger with max crit so get that and enter god mode