I have monkeyed around with varying rh%'s and found I actually prefer a higher rh. But of course everyone's taste is different!

Drake......I don't know of any way using foam to affect rh to the low side except possibly allowing to dry out just a bit as the previous poster suggested - OR, now that I think of it, you could try reducing the size of the piece of foam in the puck. That might work!!!

Or you could try the Climmax beads whcih can be obtained to regulate to either 65% or 70% rh. Check out the info at the following link:

http://fujipub.com/climmax/

If you do any internet searches for "climmax beads" be sure you spell it with TWO "m"s or you'll get some ah......ahem....interesting results that you may or may not find amusing.