Personally I would get rid of the DEPO headlights.

I have a similar problem with my ZKW headlights. The projector bowls are burnt and do not provide adequate output. As far as fixing it, you can do the retrofit yourself using the kit in the link you posted. Or you an source AL headlights like some members have.

The third option is to send your lights to lightwerkz. They do a complete retrofit using new projectors. Cost of labor is $285, and the projectors run $140 for this application. Cost is $425 plus return shipping.