I've been coloring my hair for a few years. My natural color is dark brown (with a good amount of gray) but I've just recently lightened to a more medium brown which is what I want. I don't want to go darker but I'd like to add some warmth and red/auburn tones without it looking brassy. I feel my color is too mousy -- it lacks richness. I currently use 6N but feel it's looking too neutral almost ashy. I guess this questions is for more experienced colorists. Any suggestions? Should I mix colors? Add a toner? Glaze?
3a/b, fine texture, low porosity, normal elasticity, mod-CG 7/11/11

Poo: KC Come Clean, SM Moisture Retention
CO: CJ Curl Rehab, CJ Argan & Olive Oil, Renpure Argan Oil, YTCucumbers, Sevi Pumpkin
Style: AIF, HESMU, Biolage gelee, KCCC
LOOB for second day hair

Like BS/ACV rinses, limit protein/humectants.