I tried to solo this raid about 10 times. However whenever I tried to charm the dogs for a second round, I could never kill the beholders fast enough to keep them out of the center and release the dogs. This is fine, I don't think this raid should be soloable without some amazing build or strategy. However I felt it was too easy for 2 people. we didn't run into any real conflict. The trash was easy enough for 1 person to patrol the permiter and kill before they reached the center. However we did fail on a EH run because one of us died to a crit from Xyzzy. Maybe you wanted EN to be easily completed. Screenshots below.
One thing that was very annoying was that even with no trash around, the dogs would seemingly attack the air at random and not do any dps to her. In the screenshot below you can see that only 1 of the dogs is facing her and doing damage. You could sometimes remedy this by running to the edge of the map and making xyzzy chase you, then run back into the center and let the dogs re-agro her. But this would also waste time.