SCX also has a 1:43 scale system which my kids have. It can the Carrera Go systems are interchangeable.
If you removed the magnets from the cars, you may be able to achieve lower speeds. They also offer digital control systems which may add some precision as well. I think part of the low speed issue is due to the motor having to overcome the pull of the magnets. Higher level slot car racing actually removes the magnets completely for racing to really test peoples skills.
