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Norris calls for harsher F1 penalties amid suspicions of deliberate rule breaches
(www.motorsport.com)
5 seconds and a 5 place grid drop, carried over to the next season if the last race , might do the trick.
As it stands 5 seconds isn't harsh enough unless they force it to become a pit stop penalty and must be actioned in that race even if you've had your pitstops already.
Either of those maybe a better deterrent.