I like puckducky, tuisinthekowhai, itstartledme (also posts a lot of Flyers stuff), theladyscribe... A trick that might help is to click on a post you like and look at the tags people have reblogged it with, and try out the people whose tags are chatty and not obnoxious.

tbh I get most of my Pens fandom interaction via locked Twitters, though.