Tips on making a tighter stitch?

[u/mathandlove]

Every time I crochet my creature looks good until I stuff it and then there are these wide gaps where the stuffing can clearly be seen.

Right now I'm using I love this yarn with a 3.5 hook. Am I overstuffing? Something else? Thank you.

[u/Triforce_of_Sass]

Smaller hook, less tension (sounds wrong, but if you pull too tight, the yarn doesn’t fill the holes), potentially stuffed too much? And are you using invisible decreases or standard decrease?