Cars Slower in single player

i noticed a while ago that in practice my lap time fell off a cliff with any car round any track. but recently i discovered an issue where in single player it seems that every car i drive has reduced power compared to multiplayer. For example, in the f2004 when i go on the multiplayer spa server and use a custom setup i lap in the 1:41s and my car tops out at around 207-208mph, but when i went to practice offline i was lapping in the 1:53s and car couldnt get beyond 6th gear and got stuck at around 185-187mph. I used the same setup as multiplayer yet im massively slower on the straights. Please help.
 
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