I have four six footers stacked, so I'm not going to be any help to you.
All four cages are touching, no spacers, so I'm taking advantage of all heat sources to actually heat two cages to some extent.
My bottom cage is set at 78.6 because the belly on the cage above is at 112.4. (Belly heat of cage 2 is directly above the RHP of cage 1)
The second cage RHP is set at 80.3 because the belly heat on #3 cage is the same 112.4.
The third cage is set at 87 because the heat is on the opposite side of cage four. It's a Boaphile cage and the RHP can not go on the other side because of the way it is built. I know,it doesn't make sense for the forth cage but since heat is on the opposite side it will get too hot on the cool side if any hotter on the hot side.
I played with different probe placements, but this wacky set up worked best.
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