@swaggywaggy I had the thermal pad touching the scotch tape that was holding down the riser cable to the spine of the case and no issue for 2 months. To be safe you could move the riser cable over as mentioned above and then put on a thermal pad thick enough that it touches the spine of the case, effectively spreading the heat all over.
Do you by any chance have a picture of this? Since I can't understand how this is executed. Especially when in so close to the riser cable etc.