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Hi Marc,
My wife is a horticulturist at Bunnings.
She said that you may be expecting too much from Japanese Box.
They only grow to about 30-40cm and so would not be much good as a hedge.
She feels that you may be killing them with kindness, eg over fertilizing, or water.
She said to take em back to Bunnings and speak to their resident plant expert.
But again, she is not sure they are the best plant as a hedge.
Hope this helps.
Edit: Re Roberts point, if too much building rubble underneath, could be lime in mortar could be leaching into the soil.
This could effect the Ph adversely.
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