Ok, I've decided to switch from undertank heat mats to flexwatt heat tape; because I'm getting temperature discrepancies between different heat mats that are connected to the same thermostat. So, my question is, if I need 65" of heat tape, can I cut exactly 65"? Or do I need to follow the panel size? The 11" heat tape is 12.5" per panel, therefore, if I need to cut according to panel size, I'll end up with 75" (6x12.5") of heat tape. What am I going to do with the extra 10 inches?