Mine is 2 up in the rear

If you go -1 in the front its the same as 3 up in the rear.

You have to take into account the 06-07 600 are geared very tall so you aren't going to hurt your bike if you go 3 up or -1 down... Again you will go 75 in first gear but much better than 85... example front sprocket is a 16 front and 43 rear
My bikw now has 45 rear and the bike doesn't come up hard at all...
I rode my friends 06 600 with -1 down the advantage is much better midrange ..,. also the engine , tank and seat have a forward design to keep your weight on the front wheel. hopefully this brings some insight. I was happy with my stock gearing but I do like the new setup on mine.