OK, in order to get back to normal shift points at min throttle I changed the weights to lighter ones. Now I have the 1 and 2 weights and the green and blue springs (a bit stiffer than before) in the governor. I thoroughly checked the function of it again but could not find anything wrong.
I will try my luck tomorrow with a minimum TV adjustment as stu suggested. I'm a bit scared with messing with the TC cable so much because that was the reason the clutches burned up in the first place.