Problem with bunnyhop

hey guys,

i've got a problem. I got a new mouse und now im not able to bhop. I binded, like always, +jump on mwheelup but its impossible to bhop because i dont jump directy when i hit the ground, the model stays on ground for a few ms, but that slows me down and i cannot jump fluently.
The newest mouse drivers are installed and i hold my old cfg

My mouse :
http://www.mediapoint.lu/images/articles/8648d82baef1980ea95bbac6c86db362_5.jpg

Can you help me?

Jako

Maybe you just need some time to get used to the mouse :P

I realy dont think so I think there is a problem..