With my inverted L i have a groundwave on 160 reaching out 90 miles ( 77 feet high)
After that there is a "dead"zone where the skywave doesn't reach, after 300 km's the first hop comes down depending on the hight of the reflective layer.

All with 200 watts...
If i use 1000 watts in the same antenna my reports go up in the zone my s=kywave reaches down, the dead zone itsself changes hardly, the higher field might in fringe area's become just clear, but the dead zone doesn't change, further out after morre hops i found that the dead zones become less pronounced using more power here, maybe because the reflection from the skywave scatters more.

I also have the OCF antenna here which with coil and added wire is resonant on 160, and just at 45 feet up is a skywave NVIS antenna for 160.
Totally different pattern, good for Europem bad for DX.
But it fills in the first and 2nd dead zone nicely, so using both antenna,s in Europe i can cover the field without dead zones..

Same goes for more power, i expect from 200 - 1000 watts to see just under 1 S point change for the better, sometimes that is a (lot) more...
Maybe the refraction is better using more power as just keeping in account the extra power.
Sweet spot is about 600 wats power, the difference between 600 or 1000 watts is mostly never rewarded in signal reports.

Using the inverted L with MFJ 998 legal limit autotuner on 80/40/20 i see the same happen as 160, though he bands have their own specific propagation effects.
Also using the OCF or L makes me cover the bands almost without dead zones.
With a homebrew amplified Loop antenna as extraa receiving antenna i'm set for most bands and propagation on my small plot here.
For the bands above 20 i use an Imax 2000 with 15 feet long radials to get ou.

Though the OCF will work on most bands there, the vertical with it's lower angle of radiation mostly wins hands down.