Welcome to the forum, Lyndsey! I suggest you get your 5 "new member" posts in and then hop over to the
e-liquid forum and post your query there.
I'm not familiar with dekang liquids, but my personal experience in 8 months of
vaping menthol and 6 months of DIY'ing is that e-liquid color has little to do with flavor. More likely it's the quality and/or quantity of menthol additive that's making the difference.
Also, how are you mixing your menthol additive? Starting with menthol crystals? If so what are you mixing them with?
Since taste is so subjective, and there are so many variables, it's almost impossible to advise you on matters of flavor. My best advice is to experiment, then experiment some more. Read, research, and experiment yet again.
Be sure to check out the e-liquid forum. Good luck!