ok i dont know where to post this but here is my problem

I wanted a programable smoke pump for my wild hare edge 540 so i took a old Don harris smoke pump and i put a brushed esc on it well when i am programing it to a mix to mix it in to my throttle i am having a problem

I have a futaba 8fg the problem I am having is when I am seting up my switch pos which it is on a three position switch on my radio because that is all I have left...
Ok so if I set up the bottom of the switch to be off and then set middle to be on and then again for the top to be off when i turn the switch to the on pos which is the middle the pump will work fine but if i happen to switch it to the all the way up pos the pump starts going faster and will never shut off with my mix so what I am trying to figure out is how to disable this top switch or is there some way i need to program my speed controler any help