First give the heat tape and tub a day to adjust. Also, you only need the back 1/3 of the tub were the heat tape is to be 90 degrees. So you helix running at 105 degrees to but the back of the rack at 90 sounds fine to me. My helix is set at 99 degrees to keep my rack at 90 and that is also in a room that is about 78 degrees.
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