[RGK20m3]

Based on my measurements and the schematic, you most certainly will have the same issue (if your 38-690 is not modified). You don’t need the IR thermometer, just measure the voltage across the two field terminals (smaller diameter pins) on each tweeter- one will be 40ish volts, and the other 80ish volts. After operating for a few minutes, the 80v one will be warmer to the touch, and hot after 15 minutes.
Voltage across the woofer field will be about 250v, yet cool.