The problem, even with removing one coil, is the 'on the limit' handling, as Jay says, if you pootle about a 15mph then angle cutting 60mm off a spring shouldn't be an issue...
But if you angle cut a single coil off and drive the car at the limit, the chassis control can (will) be destabilised and the handling become unpredictable... Taking very high speed corners with undulations is the hardest task for suspension and any unpredicted pitch or bounce is something to be seriously avoided.
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1985 WR quattro, 1985 20vT RallyRep, 1993 MTM ABY S2 Avant. 2010 S3 Sportback.
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