Im thinking about building a rack that holds the two different sizes the 28 qt tub is 23"x16 1/4"x6". the 16Qt is 16 3/4"x11 7/8"x7". im thinking about placing 2 front facing 16 qt tubs to a row with one side facincin 28 qt tub.. my question is if i run either botom heat with 3 in. flexwatt will I have enough of a temprature gradien in my 28 qt? because im runnin it down the whole side. and also will this cause different tempratures in the small tubs vs big tubs?