100 on the ingame slider is actually just unlocked FPS, as can be seen on things like RTSS. That is what caused the bugs, your mouselook polling is based on FPS and the higher it goes the lower your mouselook sensitivity.
Your graphics card could theoretically be putting EQ in to a low power mode with the new FPS lock. You could see if you have any luck going to (only know how for Nvidia, while EQ is closed) NVIDIA Control Panel > Manage 3D Settings > Program Settings > Add > eqgame.exe and then using the dropdown menu to locate EverQuest (eqgame.exe) > Power management mode > Prefer maximum performance then clicking apply in the bottom right.
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