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funny you should say bigredd seals, saw them do the same after a couple of track days. they were fitted by someone as i talked them through doing it so it was down to the quality of them.
for how far out it is i'd pump it a bit more until it's almost out, then swap them over and the piston...
make sure it's got the correct outer cv on it, seen two now that have had possibly a megane cv on them? does fit but abs ring is miles away from where it should be.
Be wary of used boxes, seen few now that when fitted aren't as good as the seller claimed them to be.
Heavy clutch is just from mileage/age. You could change the cable but highly unlikely it will make any difference.
will try and remember how it's done, i did it last on the wife's car but that was a while ago. it couldn't of been that bad to do though as i would of remembered it being a pain to do...if that makes sense??
check piston dimensions and take it from there, plenty of high comp pistons listed across the range and i'd be surprised if you didn't find something that wouldn't be a straight fit. iapel do a good range and cover some of the older stuff and smaller engines so they would be my first start.
if...
afik the stock piston is a flat top but knowing how lazy renault are something else will fit it, i've not noticed anyone listing high comp pistons for them but am sure you will be able to get forged rods from aliexpress easy enough.
i take it you can't run boost to stay in the same class?
had issues with the loom on both circuits, didn't check the actual problem as the car had a few issues so it worked out cheaper to just swap for a known good loom. still got the faulty loom and will probably open it up one day.
torque is s**t!!!!!!!!! get it read with something decent, need to check other stuff for codes, don't be surprised if you have short on ac pressure sensor circuit.