Are the soft ones you are using Toric ones or are they run of the mill Soft lenses?
I did wonder this when I had gas permeables as they were often drying out.
I reckon the only solution to dry contact lenses is wearing glasses. Sounds severe but I know that some eyes can not produce enough 'water' to deal with the foreign object in the eye. This used to be a huige problem with people with the old 'hard' lenses but has been improved. However my opto tells me there are some people who just can't produce the moisture to keep the lenses moist and hence comfortable.