I'm not sure why mine is so much quieter than yours. What are you powering the servo with? I will be offering these soon, just working out the stalk/ servo attachment method. Once that's done, I will be ready to offer these. I will be adding the kit to my sellbuddy ad when it's ready to go.
That's what powers mine, so maybe it's just the servo. I'm hoping to have these ready to go by next month.