firstly, thanks for not taking offence when reading my answer, it did read as if I was being rather arrogant, it was not intended that way.
I always use a warmtone developer. I settled with Tetenal Variospeed W (the w stands for warm) Prior to this I was using Ilford's Warmtone developer. I found that there was no difference in both developers when it comes to the look of the final print. The change was just down to the fact that the Ilford developer leaves a brown residue in my Nova slot processor.
My film is almost always Ilford Delta 100 developed in a staining developer, usually Prescysol ef, though I am experimenting at the moment.
One thought, you mentioned earlier that R.C paper had better tonality than the F.B paper. This leads me to believe that you may have a problem with your dry down factor. It is known that the surface of F.B will dry out with more vigour than its R.C sister paper, not a great deal, but it could be enough for your highlights to loose their sparkle. When that happens, your whole print will end up looking muddy and flat.
I hope this helps.