FPS drops in FFA

I need help in solving an issue regarding my terrible FPS in this game. My system is:

-CPU: Ryzen 5 2600X
-GPU: MSI Radeon RX Vega 56 OC Edition
-Motherboard: Gigabyte B450 Elite
-RAM: Corsair 16 GB at 3000 Mhz
-SSD: 500 GB Samsung 970 Evo
-Power Supply: Corsair 650W 80 Plus
-CPU clock and temp when gaming: 4.1 Ghz at 60 degree Celcius
-GPU temp when gaming: 45 degree Celcius
-Monitor: HP 25x 144hz 1ms response time with amd freesync
-Resolution in game: 800x600
-All of the drivers are up-to-date

My problem is that I only get around 120 FPS in Free For All game modes, and I know that I should get 200 fps constant with my system. My FPS would sometimes even drops below 100 which is absurd. In any other games, I get the normal frame rate that I should get. For example, I get 250 FPS average in CSGO and 200 constant in League of Legends. In games that demand a high GPU usage I get around 144 FPS on average. I just don't know what is wrong with Crossfire and this problem seems to occur only in this game.

I have tried many things including disabling in-game replay, game DVR, game bar, windows 10 game mode, anti virus, full screen optimization, and AMD ReLive feature (similar to Nvidia shadowplay), but nothing worked ...

Please help me resolve this. Thank you!

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