Cannondale Hollowgram wheels - clincher tyre mounting

I've just bought a pair of second hand carbon wheels - cannondale hollowgrams (rim brake 700c). I've struggled to take the old tyres they came with off (they were cheapish Conti's - shoot!) and have absolutely failed to mount new SWorks tyres.

I've mounted wheel/tyre combo's for over 30 years with little or no fuss but these have defeated me! :(

These are the first carbon wheels I've had though, so not sure if anyone else has had issues with these rims or has advice?

Ta, J

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