When you say "...it calms down it resets to normal again", do you mean the processor/CPU speed? You wrote "GPU" in the title, which is the graphics, so which one is it?
IF the CPU speed is resetting, it could be several things:
CPU power saving options are enabled and have lowered the speed at low CPU load.
When you start Formula Drive to use FAN-tastic tuning, you have the "Auto apply when program runs" option checked in the OC Tweaker screen. The settings in the OC Tweaker screen do not match those in the BIOS, so your OC changes, if that is what is happening.
When you start Formula Drive, you are selecting or it is automatically selecting a different Operation Mode, which is really a Windows Power Plan, that will change how your CPU operates under load.
You have not given us much information about what you are doing and using, so hard to give you a good answer.