and then place the top perfs along the left, bottom and right
Careful with that.
Ken Shaib (Sp?) has warned that the top and bottom perfs are not to be compared to the sides. It has to do with unidirectional paper mesh; i.e. that paper shrinkage can give false alignment readings.
For this stamp compare right to left, if you can first rule out reperfing on the left side. Probably that will mean importing an outside reference, although the left side alignment compared to top looks pretty good. Much better than the right.