No worries Dave,

I have a triangular chute mouth and find it really good as you are always putting the kite up and down heading down wind so it feeds in easy. I also get not torque on the pole which is great as another less thing to fail. Most guys seem to go for the triangular but they both seem to work. Personal preference really.

Just have a look at your hulls after you use the spinnaker the first few times, and if ensure there are no cracks or deformations, but sounds like you should be right.
Luke