The bit of tub for the probe is a great method I have used a bit of the lid in the past as my rack is lidless design...
The back heat does need more power to do the same job it does add a bit to ambient air temps but not enough to over come a cool room anyway so it really is a small gain.
no you should not have too many problems doing that assuming you ca cut the flexwatt at 8" sections some versions you can some you can't.
Nice looking job BTW!
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