Tuning Need some help with a tune for my FX Wildcat MK3

First of all I'm not even sure if this is possible, and was hoping someone here could point me in the right direction. I would like to be able to shoot Hybrid slugs and Hades pellets with my Wildcat MK3. I would like to use the power wheel if possible to say turn the power to 7 for slugs and back down to shoot the Hades pellets without having to adjust the regulator. I have it set up now shooting about 885 to 890 on power wheel setting 7 with the Regulator set at about 148 or so. My gun is the . 25 MK3 with the 500mm barrel. I think I am going to have to get the FPS over 900 to shoot the slugs accurately. They shoot just okay now but not like the Hades pellets. First of all is this possible, Second is how do I go about doing it. I have a chronograph but not much experience with tuning procedures. Thanks for the help guys!