Digital BW, The Print

A few questions:

1. I am using an 1160 with the CIS system from Cone, and have the Piezo ink in the CIS now. How should I go about switching to the FS inks? Can I just pour in the FS ink into the Piezo bottles, letting there be some mixture between the Piezo and FS inks initially? Otherwise, I would have to empty the Piezo ink now in the CIS "cartridges." If so, how do I do that?

2. I looked at the MIS website and found that they state that some people prefer the Epson driver to the Piezo driver. I find that hard to believe as I find the Piezo provides much better (smoother) gradation and virtually no dots visible in the highklights. The Piezo driver is also faster on the 1160. Does anyone find

3. Someone on this forum has stated that the MIS-FS have a different gradation than the Piezo ink, while other people think  the gradation is the same but that the tone of the MIS-FS inks is cooler. What are the facts?

--Mitch