[Cob] COB NOT DRYING

[CM Hellwinckel]

Hello,
 
I'm building my first cob wall and the first layer on the rock
foundation is taking over 2 weeks and counting to dry.
My mix was 60-70% sand and 40-30% clay.and straw.  Its been cold and wet
as usual in East Tennessee but I have kept the wall covered when
precipitating.
Should I just be more patient or is the wetness an indication that my
mix is wrong?