Hello, I am new to pixls.us.
IMHO the best way to increase color saturation is using curves on the lab a and b chanels. It alows you to increase contrast independently on the red or green of chanel a and of the yellow and blue of the b chanel. Dan Margulus has written articles and books on how to work with lab color model. Althought based on Photkshop, one can easely adapt his ideas to RT or DT.