In home mechanical chime and Ring doorbell pro 2

I connected the provided Pro Power Kit v3 to my in home chime. I set the Ring app to use in home chime and set it as mechanical. When doorbell is rung, the in home chime doesn't sound. I contacted support, they told me to remove the Pro Power Kit because it wasn't needed with the new Pro 2 doorbell. I removed it and the in home chime would now ring when the doorbell was activated. Today, I noticed a humming coming from the in home chime. I reattached the Pro Power Kit and the hum stopped. My question is two fold. How do I get the in home chime to work with the Pro Power Kit? If the in home chime will only work if the Pro Power Kit is removed, how do I stop the hum? As a side note, when the power kit is attached, according to Device Health, my transformer voltage is 20V and power output is level 1. When the kit is removed, my transformer voltage is 19V and power output is Level 2.