I have an EV13 also. Makes good power and runs great. I also have some noise. I have Andrews adjustable push rods and with them correctly adjusted there is more noise then stock.
After doing the research this cam was a better choice than a 27 for what I wanted.
I feel what your are hearing is normal for the setup. Just make sure your push rods are adjusted correctly. I also have a little gear whine, but not much.
My setup was done by Carl's Speed Shop in Daytona Beach. Carl did the work himself. It was interesting to watch him. He holds or held many motorcycle speed records. He also replaced the stock cam bearing with a Timken, did a carb tune and test road it himself. I asked why he was going to do the work and not on of his techs, he said it was a slow day and he wanted to do something he enjoys.