A 10 point difference is not an improvement or a decline (depending upon which direction you go). The standard deviation of the official test is 30 points, which means any scores within 30 points of each other are not statistically different. The st. dev. of our test is about 50 points. The st. dev. of GMATPrep has not been published but I assume it is a little bit worse than the real test (because the question pool is much narrower), so I think of it as 40 points.

So a 710 and a 720 are really about the same score - there's no statistical difference between the two.

Aside from that, though, nice scores! Those are fantastic scores in general.