Thank you, Georgik57!!!! This worked, thank you so much!
Now i want to ask, why when I set some speed to user, it's like the maximum fast, and the number of the speed doesnt matter, it's everytime that fast. I want to ask, how am I supposed to set_user speed, just little over the normal. Like if the normal is 250, i want to set the user speed 300. Perhaps it's again something with new float, but i'll be so grateful if someone tell me what to do.