Not a straight forward answer.
Firstly it depends on a number of things like: is this a pre or post tax contribution, what marginal tax rate are you in, how much do you already have in there, are you already maxing pre tax conts, when are you planning on retiring and so forth. Also what is your personal view about super and the govt actions into the future.
Personally I can see increasing govt debt and a massively ageing population, so I see a govt desperate to fund say the next 20-30 years of "old folks", who paid their taxes in anticipation of some support in their last years ( same as they did previously). By about 30-40 years the worst of it will be over hopefully????
If the current socialist mood prevails I think the govt will be happy to provide some incentive for funding of a mustachian type retirement in the realm of 20-40k p person. So do your math to end up with somewhere between 500k-1m in super per person - I think going for more is risky…if adding 5000 now makes sense depending on your figures then do it.