Hi, Sorry to gatecrash your site with my convertible Twingo...
For those who are unaware, we share the same powertrain!
My car also is a little 'sticky' or 'notchy' changing out of 5th gear only - all the other gears, and strangely, changing up into 5th - are like 'a knife thru butter' as they say.
I had a new gear linkage fitted by the dealer, which made little difference. (1000 miles covered). Over on the Wind Forum one writer reports he drove three of the 133vvt models and they were all like it, apparently his own car suffered until he had covered 7000miles when it improved noticeably, hence I'm waiting to see if mine does likewise.
Hope this helps, would be interested to hear if any Twingo RS owners have similar experiences? There are less than 700 Wind 133vvt's out there so not much feedback.
Please post up whatever your dealer suggests/does!