I had the same problems with the same dimmers.
The trick...put much lower wattage bulbs in. If you start to get anywhere near 500 watts it puts to much strain on. I think I have mine near 250 watts and its now silent.
The trick...put much lower wattage bulbs in. If you start to get anywhere near 500 watts it puts to much strain on. I think I have mine near 250 watts and its now silent.