This is a rather old thread, but anyway, for future reference: silica is seriously the best desiccant, but it gets saturated quickly. (No wonder you don’t see any improvement, 6 days or 12 does not make any difference if the stuff is saturated.)
My advice: get more of it, and change frequently. Also, if available, get some with a colour change indicator of the degree of saturation.
You could also dry the silica in the oven at low temperature for several hours, but this does not make sense for small quantities as well. (But if you bought more, you can re-use it like this nearly indefinitely.)