Ok,
I had my first race with the mtx5 and the car was very good.I had a striped second but i think it was due to a hit on with one more car and that moved the engine a bit .
I found that you should but the mesh as close as posible with a litle to no gap but to check that it moves freely with no binding. No striping in the 30 min final and the gear was as new. I used the plastic gears in the diffs no problem , now they have about 2 liters of fuel in them. I am however going to rebuild them now with fresh silicone. I am using the xray shims for the diff which are a litle thicker as per instruction of a fellow member here , i thin he is seicick!! which i theank him for the tip!!
i am very happy with the car until now.