CenRacing have a point there. i have the slide carb on the os 18 in my rally and the bottom end is delivered very quickly and is hard not to give it too much gas, entertaining and impressive - but not the fastest or most gracious of setups!
i have got around this slightly by fiddling the linkage, but again this is tricky due to the car being laid out for a rotary carb.

basically - get the rotary mate.