I currently have 4 CB-70 racks. I use the RBI large hides in all of them. I have my helix set for 95. Since all my girls eat every week (unless in shed) I assume they are happy with the setup. My probe is taped to the flexxwatt with aluminum tape. It has been this way for almost 2 years with no problems, and I can't imagine how there could be a problem.
In all my CB-70 the heat tape seems fully recessed so I'm not sure what you mean, do you see the leading edge sticking up so the tub catches it?

Also for the aluminum tape thing being dangerous? If you look where Rich wired the flexwatt to the cords its all attached to the side and covered with aluminum tape. Rich has been building and shipping these racks for years and I have NEVER heard of any complaint about the aluminum tape causing a dangerous situation and I'm pretty sure with all the hundreds (maybe thousands?) of racks that he has shipped it would be known if it was as problem.