No. It's not. What you are doing is half a press and half a push-press. If you want to do a push press do a push press. If you want to press, press.
If you can't add the weight each week, then you need to plateau for a little while and then try to add more. Or, try some non-linear strategy (Texas, 5/3/1, what have you) to bust through the plateau. But the goal is to get strong, not to increase the numbers. You don't get strong by pushing up with your legs, unless that is the lift you are trying to do.