I would be very happy with a group like that! The marginal stability is not necessarily a bad thing, from a terminal ballistic perspective. That bullet would probably tumble in the game animal, instead of just punching a pencil hole.
You could convert it to «flat base» by adding a gas check, as the boat tail accepts gc. I doubt it would help, but it could be an interesting experiment. Another interesting experiment, would be to shoot it at 200y. Would it yaw more, or less?
Note to self: try to find some titegroup!