I mix all the time. For example:
JC Domestic 2 parts, JC Tennessee Cured 1 part
JC Rainer 4 parts, JC Domestic 1 part (or JC Swiss Dark 1 part)
JC Tundra 4 parts, JC Domestic 1 part, JC Swiss Dark 1 part
JC Swiss Dark 2 parts, JC Vanda 1 part
I never stop experimenting with different formulas, it helps break the monotony. It's strange that I was happy with just one analog, Marlboro Red 100's for many, many years; but with vaping I am constantly trying different combinations. It's all good.