Hello Guys! Just an interesting update about my gearbox.
About a week ago I planned to take out my box and check/replace clutch packs. I did not do it as my car started to change better and better and finally become perfect (i have already driven it about 4-5 times few hundred kms each days, many stop and go, cold and warm start, without any late or rough changes!)
The fact is that about 600-800kms ago I put Xado trans revitalizant into the box as last trial. Also fact that I have changed the oil 2x before (about 2000kms). So I do not know finally which has solved the problem but it works fine now!