what do you think will be annoying?
if youve got an art instagram, people are following for your art, and thats what they want to see. its your personal posts that people are more likely to find annoying (well, personally anyway)
the first thing you can do to promote your comic on instagram is do update posts! you update every wednesday? every wednesday, post a screenshot from that update with a little 'update!' graphic, and share a link to your comic in the bio! youre pretty good on the hashtags - but look around for some more, theres always a new hashtag and community to find. i like #indiecomicsart #webcomicwednesday and #webcomicchat for comics
also, share WIPS! only sharing final pieces can get monotonous, and you can run out of material - you can also share sketches, process pics, and videos. this will increase interest in your instagram as youre giving a window into your artistic process.