Im using all 8 watt tape. Even the area thats side by side is gonna be hotter than just a single strip. I know that where its folded its gonna be hotter but the tub doesnt touch it. The rack is 2 foot deep and the tub is only about a foot wide. So it has a bit of a distance inbetween. Later on ill soder on a new plug.
The temps are fine for now though.