First, if you just set Bot ratio ingame to 100, and set 48 bots in the next slider, then you will always get those 48 bots for axis team. The rest of the 100 bots goes to allied team. That is why I personally always play with 96 bots, so you have an equal number in both teams. I don't know how to get more bots myself, as I never really needed more
Second, You may want to look into the Forgotten Hope 2 Discord. It is far more populated, people there might help you further with getting more than 96 bots in equal teams.