They could all use some refining but these are the best ideas so far. I get what you're going for with the bottom left one but as was said, it just ends up looking like a recoloured Target logo. It might be worth adding a plane to it like the Winnipag Jets have.
I was actually going to make the point that the only clubs in the league that don't use their nickname in their logo are Carlton (because blue is a colour), Fremantle (for legal reasons) and GWS (super modern logo thing). Not sure what Melbourne's excuse is - probably something to do with being the first club.Monograms are okay. But not as a main logo.
If we get rid of a plane off the logo we may as well get rid of the bombers part of our name.
Monograms for logos reek of Carlton. Funnily enough the demons have been trying to be Carlton for years with their tanking.