gotta drill at an angle to get that oval-ish shape and it looks like you didnt angle the rods out away from the boat, facing straight back wont be the best for ya
Good luck trying to start a hole saw on an angle. Also, it looks to me like they are angled back but also out a bit, not far from the factory mold mark which is the recommended angle.
I also prefer to use rivets when attaching anything to plastic. Plastic sometime doesn't have the beef to keep screws in place and can loosen up with time
