Red dye can be a frustrating experience, it either goes on really light or really dark. Technique is critical, run that dauber in circles, swirling the dye in overlapping loops. Do this quickly and accurately. You may have to run two lengths to get it even. This technique I learned from a book written by Stohlman.
If that doesn't work you might have to do the water flood. This is where you wet the leather surface till its nice and evenly done then run the dye over the surface in those swirls like before. This lets the dye penetrate slower and more evenly. Only use this technique with regular dye, it will NOT work with the Fiebings Pro Dye and I have not tried it with that Eco Flo dye from Tandy so can neither confirm or deny its usefulness.