I need some help please. I have a Hobbit with DR kit and Proma exhaust. Stock belt. I had the stock notched variator with 27grams of weights total and it variated fully. I just upgraded to a derbi 6 roller with 26.4grams weight total and I am not reaching full variation. The belt looks a lot tighter with the derbi variator. Can the belt be causing this issue or the .6gram weight difference?