The eagle autorouter really isn’t all that bad, you just need to know how to use it. First thing I do is start by giving the router as many choices as possible.
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Change the routing direction to ‘*’
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Change the routing grid to something appropriete, I have found after many trial and error a routing grid of 0.1 mm with traces from 8mil - 12mil.
For some reason eagles router seems to be alot slower then other routers i’ve used but with 0.1 mm grid then its not to big of a deal anyways.
I’ve played around alot with changing the settings in the optimization passes with little change in the overall result. The most effective way of reducing vias in eagle is selecting a appropriete routing grid and the placement of your parts.
my 2 cents…