[DByers]

Steve,
All those LED lamps are entry level products and the drivers are not that adaptable. I can research a little tomorrow for you but try going directly to the manufactures website to see which type of dimmer they suggest or require.
Lutron makes a "CL" dimmer that is made for Edison base LED retrofit lamps that should kill the buzzing. You can find them at Home Depot or online. I Could send you one to try also.
Pass & Seymour makes an adaptive dimmer that I have great success with when others have come up short. It is a premium in the cost department.

If interested I can post specs tomorrow when I am in the office and have all the info in front of me.

This is basically what I do most days by the way, find the best compatibility of LED product and controls to work in different new and retrofit applications for both residential and commercial projects.