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its ok to go past max pressure a touch
It should be OK to go over it quite a bit, the certification test is something like 100% over the rated maximum. If you're going to high pressures on larger tyres to get them seated, you need to be particularly mindful of the rim pressure rating, which is often lower than the tyre pressure rating and decreases as the tyre section rises.
soapy water
Lubrication is good, but remember kids, the lubricant is the water, the soap is only there as a wetting agent. Everything which isn't water is going to be left as a contaminant after the water has evaporated, so use as little soap as possible.
thanks hive mind, problem solved - went past max PSI and all things are peachy down at more normal pressures...
...for the next me, things I learnt: