I would call "doing more with less" just "increase of efficiency".
What if we merely produce more with more? By your definition that would not be "economic growth"
That doesn't fit.
We can't produce X more with X more, unless there is under-utilization. Which only happens if there are political barriers to production and trade but not in a free-market. In particular there is a under-utilization of labour cause of minimum wage laws creating a bottleneck.
We can of course create X more with Y more (where X > Y) which is usually how growth is used, but that is also more with less...