Hi. Is this mini new to you? I have had my cooper s for 3 weeks and I am struggling with a heavy clutch too. Another member on here advised me to grease the clutch linkages under the bonnet so I am going to give that a go this tomorrow and see if it improves it at all. Will post results. Its seems that a heavy clutch is just how it is with mini gen 1.
Is it when you apply the throttle again that you are getting a jerky change? one of the things that i moticed with the mini is that the fly-by-wire throttle is quite delayed. I found it mainly noticeable in the shift from 1st to 2nd. I am also fitting a sprint booster tomorrow to speed up the accelerator response so hopefully that will smooth out the gearchange too.
I will post the results of fitting the sprint booster and greasing up the linkages. Sprint booster does seem quite expensive at 165 but i my opinion if it helps to resolve the jerky pootling round town journeys it will be money well spent.
See what other owners who have had their minis for longer than me think but it does appear that these are common mini issues with the generation 1.
Will get back to you tomorrow, hopefully with good news....