I totally agree with Tom,
I use a middle filter to give a slightly light, flattish print, then I blast with a 5 filter to bring in contrast. as well use 00 filter when needed.
This is by far the easiest way to ( split print ) and it also allows the worker the most lattitude in printmaking with VC papers.
Pre flashing is an interesting adjustment as well Jorge described a method of pre bleaching prints before development that sound quite interesting as well.
Bottom line , whatever method works best for you , use it .

I also print with graded papers which do not allow this kind of adjustment (beyond using two developers , hard and soft ).

I am always happy with the prints made either way.