Yes. The hole is just above the exhaust. There is a triangular flat part there & I cut the hole in the middle. If your gear doors are opening in flight, it is unlikely to be a suction effect on the canopy. I think if that was so, the gear doors would stay shut. If they were open & there was a suction effect, you would think enough air would get in through the gear door openings. Was it sucked, or was it blown?

Regards
Jim