Jason,
all the dimmers i have installed are rated 10w minimun load.
they behave erratically full stop - regardless of whether the lamp is an LED or halogen. I think it is a manufacturing issue that affects more than LED'S!
Make sure the dimmers are F/G type. The wholesaler may be unaware of this. As mentioned PM me if you want the specific data from Megaman and Varilight.
Dave