Dell Inspiron 15R N1550 :: Overheating / Thermal Shutdown

I've had an Inspiron 15R (N1550) for a year and a half now. Six months in, the fan shot its bearings and had to be replaced under warranty by a Dell technician. About four months ago, I started experiencing overheating issues again resulting in thermal shutdown when running resource-intensive applications for any length of time. After use, the case would literally become too hot to touch. I updated my BIOS, cleaned out the areas I could reach with canned air, and operate the laptop on a cooling pad at all times. Even this had, at best, minimal effect on the duration for which the computer could run without reaching excessive temperatures.

Recently, I noticed that the fan wasn't throttling when running high-load applications, either, so I installed SpeedFan and confirmed that it never seemed to come out of the idle state. SpeedFan appears to have fixed the throttling issue, however, even when clocking the fan to a minimum of 60% and a maximum of 100% once any of the components rise above 55-60deg (c) while blowing cold air at maximum speed from an external fan directly over the vent, I get at most half an hour out of games or high-demand video editing software before I experience another thermal shutdown. If I stop playing halfway through, then quit the game and examine the temperature gauges on SpeedFan, Cores 0-3 show as between 85-93 degrees, and two readings, Temp5 and Temp6 (the chip for which simply reads "DELL") shows as 90-95 degrees.