Australian roads are shit, unlike the smooth track surfaces coilovers are designed for. Are you actually planning on running them on max stiffness for daily driving? Your teeth will probably fall out of your head after a while.
I think they'll be fine for the most part, provided they're good quality coilovers. Any spring/shock will eventually wear no matter what stiffness it's on. Will just wear that little bit faster but if you drive well, avoid all those potholes etc it'll be alright.
If it makes you feel better my friend is running front 22kg rear 20kg on their max stiffness damper setting for his daily.
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