What are your settings?
I actually get far fewer here than any other pool! I'm sitting at about .3% out of about 300,000+ shares!
My settings for phoenix 1.50 are:
-k phatk PLATFORM=0 DEVICE=0 VECTORS BFI_INT AGGRESSION=12 WORKSIZE=128 FASTLOOP=false
I just started my miner again and will see if it works now.
With regards to the work queue empty problem:
Try adding -q 3 before the -k switch in phoenix to have more than only one queue. You probably have to figure out which value is perfect for you

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Edit:
Seems to work perfectly now and I'm back to my usual 2%.
Good! I noticed that one of my cards started to drop in Mh (30-40MH/s to be more precise), a quick restart of Phoenix solved it! Seems to be the "duct tape"!