No sweat, a sandbagger is much, much worse than a vanity handicap.
Did you try to make the ‘best score possible’? On those rounds? If yes, then post. They only take your top 8 for that reason, there’s room for bad rounds.
So long as they’re not solo rounds or rounds in which you’re not obeying the Rules of Golf at all (hitting two or three balls around, not putting, whatever).
Whether you actually do this or not… determines how “legitimate” your handicap is. Follow the rules for handicapping and it’s legitimate. Don’t and it’s varying shades of illegitimate.
All rounds of 9 holes or more that I play with 14 clubs and keep score get posted.
The exception are rounds where I’m playing with friends and playing a format that doesn’t end up with a stroke play score (say scramble or alternate shot) or when i take the Sunday bag out and only 4 or 5 clubs. I don’t post those.