I've checked your numbers as shown on the NT score sheet, and I noticed a few possible errors. First, the inside spread credit is 26 2/8", not 38 6/8". Second, the lengths of the main beams are 10" too long as you said. Third, the G2 lengths are also 10" too long. Fourth, it looks like you may have the measurements for the G3 & G4 points swapped. Fifth, the difference for the H2 circumferences is wrong.
According to your numbers (corrected where needed), the score is 239 3/8" NET NT, 171 5/8" NET TYP, OR 246" GROSS.
No matter what the score, that is a great buck and deserves to be appreciated by all. It should look great if you could get the antlers cleaned and a new cape on a re-mount. Congrats on a great find.