Brian,
Commonly, I use the vacuum to clean banneton
. Having said this, however, mine are not cloth lined. I suggest you use a fine mieshed seive to flour them with, using stone ground brown rice flour. Suspect your problem has to do with humidity, rather than flour amount.
Dump the heating pad; it will make the rising dough gluey. Longer, at room temp is better. The entire basket should be covered in plastic wrap to prevent a skin from forming. Easier to show than describe.
Jim