It's your call.

You could add another cable a couple/three feet higher up the trunk, above the existing one and pull the tree more upright. It might take leaving the cables in place a couple of seasons before it would stay that way and the trunk will not be perfectly straight.

But beauty is in the eye of the beholder so if that works for you that's what counts. ;-)

Other than that, I think you've done about all you can.

Good Luck!