I switched to cypress mulch after dealing (well, currently treating) with an RI caused due to very low humidity. It works wonders, without getting too moist. Glad to see you're using that.
Also, I've done the tin-foil deal with the custom lid I made, and I have to say it doesn't look too bad. It does look makeshift, but if you have the right tank I'd say it would definitely work long term.