"Note: Speedfan is not guaranteed to work properly with all motherboards so use it at your own risk."
You must ask your motherboard maker or the author of speedfan if you can't make it work on your own.
As to the fan speed drop, my view is this is a PC in need of repair. If in warranty they will likely tell you to uninstall SpeedFan and at worst void your warranty for using that.
Okay, some of my fans are running at 4700 some 4100 and some 2000 rpm, and its keeping my pc cool. But when I load up a game, my fans all drop down to 1000, and my pc gets super hot and I have to shut down the game. This problem is happening on speed fan for windows 10

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