Tyranid List ideas

By TheGravemind I've been going back and forth on some lists for my tyranids. I've been doing decent enough with them at the past few tournaments, but since Chaos got updated, I've been struggling a bit more. My one hive tyrant has been letting me down, so I've been thinking about taking two. If I do that though, I'd have to give up the ymgarl stealers, which have been doing very well for me.