Your MPI is very, very consistent and mucking around with .2 of a grain is not going to make any difference. It never really does in an accurate barrel at zeroing ranges.
I would pick the tightest load so far and work on that starting with solid, accurate case prep. Runout, seating and maybe even a primer and or powder change with do more than pissing around with .2 of a grain of powder.
My 2c
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