Scooper, you've assumed that because a spoke has about 10mm of threads than the nipple does as well.
the most common nipples are 12 mm long. so they can't have 10-12mm of threaded portion.
the common 12mm nipple has no thread on the flat portion. the only part that threaded is the round part before the head....and a one or two at the head.
operator, still posting unfounded shade tree advice huh?
the problem is _both_: not enough threads engaged between spoke and nipple AND having the spoke too long so the nipple cuts new threads into the spoke.
that you side with the filing down of 32 spokes doesn't surprise me giving your track record of advice.
also, think twice before you open your mouth as i've saved most of the worst advice you posted here.
the bottom line is that IF the measurements of the rim and hub are accurate, then there is no reason to think the spoke will be too long or too short. if you disagree with that, then you deserve the wheel you end up with.