The 200v Servolite filter caps arrived today. Here is more about them. They were pricey. But at least now the entire system is good for 200vdc. I have only tested it to 125vdc. It took some serious tuning of the amplifiers to get it not to oscillate. The motors run cool. The Z axis was running warm since it was oscillating some. A drive pulley with half the teeth helped a bit. EMI could still be affecting it.