One thing you have to watch on these is that as the bulbs change, so does the color. For example, 80Y may be fine now, but it could be a different contrast later if you use the enlarger a lot.
Basically, use more Yellow for lower contrast and more magenta for higher, and mix the two for everything in between. There are published guides given that will get you started (thanks Hans and Don!), but the beautiful thing about using a colorhead is that you can go between the grades and easily do split grade printing using only Y and M.
Good luck! The V35 is a killer enlarger -- you'll grow to love it a lot, if you do not do so already.