V70 III D5 Polestar for transmission software update? Gear oil spraying or change sufficient?

V70 III D5 205PS Automatic BJ2010 120tkm Hello my loved ones! I have a number of questions to the v70 experts among you: Do you think a polestar tuning for my vehicle makes sense? I love it especially in the hope of better switching sequences and the S mode. I drive in itself relaxed and economical, but that excludes the wish as I find with nieces; I also let it crash from time to time… Can you expect a better switching behavior? Is the power plus sharp and measurable (significant)? Should I let the transmission flush better or reach a reasonable result with two conventional gear changes at a short distance? The latter may come significantly cheaper… Is the timing belt due after just under 10 years or only at 140tkm and how critical is a delay? Does it like to break my speed or have a good time to ride idR? Is the engine possibly even a free runner [rather, or] is the one that can’t be clean with the Dcho-data?