Gadget, you did not leave the opening in the foil for air circulation!
The rack has two positions, close to the element for regular grilling and turned over so that it is a bit higher above the element for more delicate foods, although I have grilled salmon fillets in the regular rack position. To give food a bit more flavor, I place one of the fake lava rock panels from the JennAir grill in the funnel-like area under the heating element to vaporize some of the drippings and generally use it under the range hood in case there is any smoke (none so far).
Be sure to keep track of the element support. It's small and easily misplaced.