The weight length and diameter are all correct. Ive even adjusted the barometric pressure....You would have to also post your open rocket file so that we can pick through it to be able to answer that question, but quite often it's because form factor and actual weight in the sim does not match the real world item.
If those are correct, then play with overall surface finish. Most of us get to within 5% easily, and many get within 1%
PS The max altitude via the TRS is 6507 via the filter data.
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