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Edit your ArmyOps.ini at the follwing sections and with the following values:
Those lines are already there, just change the values!
You DO NOT get CVAR pb kicks for those changes (as long as you stay Inside the values I posted below! don't go too high nor too low.)
[Engine.Player]
ConfiguredInternetSpeed=10001 <- NetSpeed should be high for you to get Past 90 FPS, I had mine as 80000, try it your self to see a lower and better value if needed.
ConfiguredLanSpeed=10001 <- Same as above, changing this ensure it works fine with 25Assist.

[IpDrv.TcpNetDriver]
MaxClientRate=10001 <- Same as NetSpeed, BUT may not have effect Client Side(test your self), I do use it for server config because I don't care .

[Engine.LevelInfo]
MaxClientFrameRate=999.000000 <-This is the Max FPS You can get in-game (online). Do 144.000000? Remember locking FPS doesn't remove Tearing, only vsync/other syncs do.

[D3DDrv.D3DRenderDevice]
DesiredRefreshRate=144 <- This is the Desired Refresh rate, I don't know how it behaves in Borderless windowed, a.k.a. "Advanced SF" in 25Assist Client Settings>Video.
OverrideDesktopRefreshRate=True <- This is to ensure you can get Refresh rate above your desktop rate.

So you have did it all and your FPS is still locked? Type: NetSpeed 10001 (or the value you prefer, max of 80000, min  2700, see explanaition above of why NetSpeed needs to be high) to release your FPS. This Happens because the server set your initial NetSpeed if you have a value higher than the Max in the server config.