Hello,
reading your post I think you mix a few different things.
1. The shorting of pin 4-5 wil set the PA in a permanent TX mode. This will not add any mW to the output power. If your drive level is >2dBm this modification is not necesseray and you will not notice any difference.
2. VK2XAX made 2 modifications. These modifications are only useful if you use the PA not only for TX (like for QO-100) but also for RX (e.g. terrestrial 2way QSOs in 2,3 GHz).
(Removing the input TX/RX switching and replacing it with two SMA-jacks; one for the TX path and one for the RX path - the output switching is not modified).
The second modification is also only useful in a 2.3GHz 2way QSO situation. Here he modified the RF-Vox to a "hard" PTT-switch. (This is also not needed in QO-100).
If you have enough drive level (about 200mW) none of the above modifications give you any advantage.
The only modification rising the output power in this situation is to bridge the output-switching diode. (and perhaps to add the small wire for a little bit less voltage drop inside the PA).
73 de Johannes