Needing to repair some ships that have had their pegs break off. What is a good glue/method for reattaching? Have had difficulty getting citidel’s plastic glue to stick.

Reglular super glue (cyanoacrylate) should be fine.

I've seen most people on the forums mention their success with Loctite brand, and Gorilla Glue. GG however, from my understanding, expands a little as it dries, so that may be something to consider.

Regular Gorilla Glue will expand, but their superglue, with the blue cap, does not. It works well for X-wing minis.