@skoobz I treat my blog on micro.blog as my single source of truth so to say.
I post everything there and just replicate it elsewhere. I did automatically cross-post to my mastodon account before, but switched to just boosting the blog using it's ActivityPub address like you do.
I do the same with my other Fediverse accounts.
This way there is no unneeded duplication and people get the same content. It is a bit more work, but gives me the chance to actually think about what and if I want to boost something at all.