Yes, the wobbling when you come down fast has nothing to do with prop guards. Or at least not enough to worry about.
If I need or want to descend fast, I set up so I have about a 45-65 deg angle of descent and can come down really fast like that.
I use them and like them. When I used to fly, sometime kids (and curious adults) would come walking over and I just thought it would be safer for everyone if I left them on. Never really saw a whole lot of difference either way but some swear theirs won't fly right with them.