Ground plane height and overall efectiveness

In my previous post, I have shown the Ground Plane antenna for 80 meters. It was designed to use the 16.5 meters tall mast. There on the market higher masts do exist. For example, it's not a problem to buy 19.2 meters semi-telescopic aluminum mast. I changed the model to see how big is the difference between the two antennas built on 16.5 and 19.2 meters tall masts.

In order to make the impedance of the higher antenna equal to 50 Ohms, I had to increase the length of counterpoises and shorten the wires of the capacitive load. The only thing I had found different was the SWR - the higher antenna has the band by the SWR 2:1 as wide as 195 kHz, whereas the lower one only 141 kHz. The pictures below displays this. The rest of the parameters are almost the same.

Also please take in consideration, the antenna is supposed to be made completely out of wires. In case of the aluminum mast, its Q-factor will be significantly higher and therefore it will have the broader band by the SWR 2:0. For example, for the mast having radius 25 millimeters the band is about 280 kHz.

Below is a content of the .maa file I have used when playing with the model.

*
3.55
***Wires***
7
0.0, 0.0, 0.0, 0.0, 0.0, 19.0, 8.000e-04, -1
0.0, 0.0, 19.0, 3.2, 0.0, 16.5, 8.000e-04, -1
0.0, 0.0, 19.0, -3.2, 0.0, 16.5, 8.000e-04, -1
0.0, 0.0, 0.0, 0.0, 8.75, 0.0, 8.000e-04, -1
0.0, 0.0, 0.0, 0.0, -8.75, 0.0, 8.000e-04, -1
0.0, 0.0, 0.0, 8.75, 0.0, 0.0, 8.000e-04, -1
0.0, 0.0, 0.0, -8.75, 0.0, 0.0, 8.000e-04, -1
***Source***
1, 0
w1b, 0.0, 1.0
***Load***
0, 0
***Segmentation***
800, 80, 2.0, 2
***G/H/M/R/AzEl/X***
2, 3.0, 0, 50.0, 120, 60, 0.0