What size are the needles? You might need to go to a bigger size needle that doesn't bend as easily.
Edit: If your machine has the clamshell-type foot pedal, you may be able to wedge a sponge or small piece of wood into it to limit your speed. This way you can use your lead foot to keep a constant speed, with the wedge limiting the max speed.
Last edited by Prism99; 11-16-2014 at 04:09 PM.