I have my probe taped right to the top of the flexwatt. I usually have to have it set to about 95 to get the temp to 90 inside the tubs.

As for the connections, how were they attached? Are they hooked with clips or soldered? If they are clipped just see if they wiggle. Just be careful not to loosen them by shaking to much. If they are soldered just look to see if they are attached still.