i don't really understand, i mean you know what LP is doing to your serve, so you know what comes back and then you know what to do against, so what is the difference to playing a grippy rubber? and if you have problems to play a third ball on the different sidespin you are used to, why not just play a different serve then? i mean any other player could have a nasty receive with grippy rubbers you never encounterd on your serve before and you would need to adapt in a game situation, so i don't see the difference here