Is this the best that I can expect from this machine?
Hard to say. There are a lot of things that can affect the cut quality.
But the X Carve is not a very rigid machine.
If you reduce the feedrate by 50%, is the quality better?
Or, try reducing the depth per pass in V Carve by 50% and see if it helps.
If the problem is the machine flexing, then reducing the loads can improve quality.