I have a couple crown C311 A as well. However, as good as Crown is, I’ve never gotten used to the restrictions of headworn mikes.

These are pricey but work very well plus very little hassle I hear. Our church uses them.

https://www.sweetwater.com/store/detail/E2W6T2SR--countryman-e2-earset-for-sennheiser-vocals-tan