Hello Bob and fellow members
Heres my set up. I moved the cable to the side - to lowest position possible. As the engine is somewhat angry in its manner - having slower ratio gives finer control ability to butterfly. I quite like how it is - would have moved the cable even further down if there was place for it. Moving cable down causes it to rub more on front stabilizer mount
Loosening the cable on track was just quick fix to get me through the day. On the same day my friend tried my kart and was done in two laps - he was terrified of the jerky throttle and was scared running it. I noticed he is shorter than me so didnt reach properly to heel supports. He also had quite fat shoes with ankle protectors that touched the cable
My thinking is to try to have zero slack in cable. Specially if having any plastic hose/protection around the cable loop - It makes the loop quite a bit stiffer. Bigger the loop is - more pedal travel is needed to make tension. By pressing the pedal cable doesnt get any tension until loop has shrunk in size and become more rigid - then cable actually starts moving the butterfly. I could see it by watching the whole assembly and moving pedal with my hand.
If - for example - doing repairs on track and having to remount the cable - with big cable loop you now most likely have quite different ratio on pedal than in previous session. For me that kind of change doesnt make my laptimes any better
Running without plastic cover is great but I dont like how cable eats trough pedal eyelets etc
So I have zip tied the cable/hose assembly to as small loop as possible.
As Evan already suggested - in my setup the spring is on top eyelet. It made throttle stiffer = better for fine control. Maybe second additional spring would make it even better
I like to keep every control system on my kart tight ie steering, brakes, pedals etc. Any slop just delays my inputs
Anyway - After this cable mod I havent had to grip gastank with my feet