Fitting the F-22 with external missiles is probably not a big priority for the USAF.
Priorities change with the mission. You should know that from your days in the military. Remind me, when did you serve, BTW?
The fact of the matter is, the F-22 has 3 loadouts that are dictated by the mission requirements. Those 3 loadouts can increase the number of missiles from the 8 you mentioned, to well above that number. The simulation that was mentioned earlier was, more than likely, performed under those circumstances.
In summation, the F-22 can carry more than 8 missiles that can be used in air-to-air combat. Just admit your wrong and move on.