Bear in mind that the better color darkroom tool is a notebook and pencil !
Write down and keep track of all parameters every time you print !
It will save papers, chemicals, time and effort. (same film on same paper : start with previously found color printing filter pack. you will be spot on or near of it.)
As to the filters, they are usefull when starting printing to find the correction eeded, the more experienced printer does not feel need for them, once your eyes have developped a sense of color. And this is good because filters fade with time ,-)