Ok,here's the deal. I've got a 20gal. long aquarium setup with 2 UTHs (1warm side,1cool side), a 60 watt CHE, thermostat, and thermometer/hydrometer digital guages. I'm using aspen substrate about 1-2 inches deep and have my warm side staying around 92 and cool side around 82-84 with ambient air around 82-84 also. I've insulated 3 sides of my tank and done the aluminum foil screen wrap setup. I have my CHE sitting towards the warm side but where it is also slightly over the water bowl(which is a pretty good size) to help aid in raising the humidity. My problem is that my humidity is still hanging around the mid to high 40% range. Averaging around 46-48. Because of this I have added some moss to the top of each hide and have had to spray it at least once a day to get it into the lower to mid 50% range. Does anybody have any advice or suggestions as to other things I could do to help increase my humidity? Also what really is the ideal range to be in, I know everybody says around 50-60% but will it hurt my BP if it dips to the high 40% occasionally? or to stay in the low 50%s? Any advice on how to improve the situation would be much appreciated!

P.S. I know removing the CHE would help my humidity% but I can't see how I could keep my ambient air temps in the proper range without it!