The directions are good, they give some baselines. I have them as well, but I haven't decided if I'm going to install them or not, I have a set of flats also that I may put on instead. You need to drop the pilots quite a bit and raise the main jets. I have Pilots in sizes 10-20 to try if I use them. I was going to go from 35-20 to start and work down from there, bump my mains up from 360 to 370 (I also have a tempaflow, if you don't have one, your mains should be at 320 or 330 probably).
1BigCat is referring to drilling holes in the pilot jet if it won't idle correctly. The same guy makes these who makes Thundershift, they support their products well, and will probably have a baseline setup for your ZRT 600.
EDIT: It is the Needle Jet that needs to have tiny holes drilled into it, not the pilot jet.