Tech Assignment

Tech Assignment

Is there a way to use a busines rules, or some other feature to help auto assign assignments in the following scenario:
 
3 Techs
 
Tech 1 does 80% tech work 20% Server Administration
Tech 2 does 80% tech work 20% Network administration
Tech 3 Does 20% tech work 80% Server administration
 
5 sites
site 1 = techs 1 and 2 get assigned requests
site 2 = techs 2 and 3 get assigned requests
site 3 = techs 3 and 1 get assigned requests
site 4 = techs 1, 2, and 3 get assigned request
site 5 = tech 1, 2, and 3 get assigned request
 
i need tech 3 to only receive a limited amount of requests for the sites he is assigned to, and have the other two do a load balance system.  So something like out of 20 calls total for all the sites Tech 1 and 2 get 8 assignments each and Tech 3 get's 4 assignments.
 
I hope that makes sense, let me know if there is something i can do to achieve this or something close to it. The round robin and load balancing options don't seem to be configurable so those don't help.
 
 
Thanks,
Michael

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