did you set the fuse for the 3rd channel ?
it defaults to the reset.
once you change the fuse setting you can only re-program with a high voltage programmer.
Wow. You are seriously full of shit. A quick check of the datasheet reveals the RESET pin is marked with...
PCINT5 - Pin Change Interrupt #5
RESET - obvious
ADC0 - Analog-to-Digital Converter channel #0
dW - Debug Wire
PB5 - pin designation
No Output Compare mark which means the RESET pin cannot possibly support hardware driven pulse width modulation no matter what is done with the fuses.