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I don't think you want to stress them anymore, rather the opposite.
Soft light, low or no nutrients, etc.
I'm no expert but I've read a million times that clones must be treated carefully for the first 1 -2 weeks.

Surely you have loads of light on them already with that 1 000MH?
The distance you can have them at is determined by the heat at the closest part of the plants.
Good luck man, I think you need to just let them relax a little longer.

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