How do I maximize my hashrate?

I have 16 Dell Alienware Aurora Ryzen™ Edition R10 Gaming Desktops with RTX 3090’s. I mine Ethereum. I use Awesome Miner, the mining pool I use is 2miners.com, and I use MSI afterburner with my core clock at -150, memory clock at +1100, power at 85%. My wattage is around 270W-290W. My hash rates are all over the place. Some will drop down to 38MH/s and others will be as high as 135 MH/s. I can’t figure out how to maximize my profits/settings/should i go with a different mining pool… My total average hash rate is around 1.20 GH/s. From what I have learned it should be around 1.90 total GH/s, or 120MH/s per card. Any advice on this would be greatly appreciated. Thank you.