I have a 4 tub rack and it has back heat the question is to get the temps right i have the herpstat @ 109 and 3 of the tubs are right on with temps however the bottom one is at 112 in the hot side. is this normal wy would the end of the flexwatt get hoter then the are that the clips are on also i don't have any holes in the tubs yet and the humi is @ 45-50 i thought it would be higher in a tub. Now do I put some holes in the bottom tub so some of the heat will flow out and up to cool of the tub? also if i put holes in the tubs will that bring up the humid or not