What consitutes a good negative? Many articles and books refer to the perfect negative having a wide range of tones etc but are there any books with examples that you can recommend?

I have recently enlarged some of my 'best' frames and have been very happy with the results especially after practicing split grade printing for a while. However my question comes from some of the enlargements being printed on a grade 3 graded paper where I have found the contrast more to my liking over and above a grade 2. These negs print very easily and have what I consider a 'good' tonal range. Does this suggest that my negs are slightly flat, lacking contrast or is it all relative to your personal taste?

I use FP4 plus currently(rated at 80) and dev in ID11 stock or 1:1

All opinions welcome

Phill