Your last line shows that you are confusing correlation with causation. First of all, you don't have an independent measurement for the actual percentage of weapons used, nevermind by what group of players (whatever "tryhard" actually means. It sounds mostly subjective and i doubt anyone here can come up with an objective metric to measure what constitutes as "tryhard").
So, aside from the fact that you can't objectively measure the things you mentioned, even IF you observe a correlation, it does not always imply causation. Nerfing weapons has been done and tested several times in this game, as a result of such an assumption, yet it made little difference overall as highly-skilled players will find a weapon, method, playstyle that is superior.
At BEST, this is an issue of whack-a-mole, where changing one variable just means the "tryhards" find another hole to jump out of and dominate. So unless you want to game to remain static and never add anything new, this is going to keep happening, whether you like it or not.
This is as honest and friendly of a way i can avoid saying "mad coz bad". Just because you lost in a game doesn't mean it's rigged. There are many other variables to consider. An obvious one is total number of hours a player has in the game. While total numbers dont automatically imply high skill, they definitely can outperform players with significantly less hours. And do not underestimate the no-lifers in this game that have VASTLY more hours than the rest. Add actual skill onto that, and you got yourself several high-calibre players that everyone will hate since they'll loose against them most of the time. Every game has these types of players btw. The real issue of APB is that the average joe encounters these guys more than in other games, because at any given time, there are like 100 players online.