The latency is not as low as other settings but at leat It works
Congratulations!
I'm sure, on EP, there was some sort of small thing you somehow overlooked.
Roughly 60 ns (if judging by the 1/2 voltage level). I would expect it to be a little bit better. Is the CPU running at 100 MHz (200 MHz Fosc)? Have you used the dedicated INT pin (pin #19) for the signal?
Anyway, this is way faster than you would get with the interrupt.