No need to compress just blow more up there. I find it hard to put too much in any attic.
As for the dust in the attic while getting up there. My solution is that we don't store anything up there. We have just an attic hatch and I won't be putting in a ladder unless I decide to put the hvac up there. (Not a fan of them in the attic but it makes returns way easier and saves room in the house and quieter)
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