We had the same problem on the Vertical, Insulated RF we built, used a couple of different products, same results, We ended up going with a tadpole gasket round seal with a tai,l used stainless screws to fasten it to the door, not sure if that would work with your door. I also have that same type rope gasket on a ECB, could not get the glue that came in the package to hold, Rutland replaced it still would not hold. I ended up using 3M spray high-temp adhesive, still on there but I don't use it very often.
gary