I think 142 is plenty high enough to argue for acceleration, honestly.

Testing at slightly older ages is more reliable, because you are less likely to have a child sit and stare out the window, but I wouldn't wait to have new scores to move forward here.

Have you and your DH filled out the Iowa Acceleration Scale? It can be very helpful when trying to evaluate whether a grade skip is a good option. It is an objective and independently validated way to assess what kind of acceleration is appropriate, and that evidence sitting there in black and white can be a useful thing to have when dealing with a school administration - or a family member who may not "get it".