After about 20 flights i decide to put on the new rudder with thicker TE, the problem was that yesterday we had strong crosswind at our airfield. So from what i was able so see is that the model is now much slower and the rudder authority i believe is better. I will wait for a calm day to see some more details.
The final weight of the new rudder is 65gr instead of 80gr of the original and i can change it in about 15 minutes.( just pull out the 0.8mm steel rod i pass through all hinges and put it back in place).

Harris