Why not fly it and check if the side thrust is correct?(fly exactly into any wind,and with wings exactly level pull into vertical climb).
Straight up--OK--Yaws right---decrease side thrust--Yaws left, increase side thrust.
Check the up/down thrust similarly, this time with any breeze exactly cross wind.
When satisfied, if the spinner looks silly(they often do!), a slightly smaller one will look better--still wrong, but with none sticking out beyond the cowl.
Or discard the spinner and just use a safety nut--lighter, cheaper, and often better balanced.