Your Guardians concept is incredible. I’m always amazed at the concepts board members come up with. It’s baffling the direction pro teams go in sometimes, when there’s a wealth of design talent here. The tie in to the Crusaders colour scheme was very well thought out too.
I’m not so keen on the Spiders concepts, but that’s likely due to how good the Guardian design is and not in any relation to the actual designs.
Edit. As for centring the logo, I think you went for the best option by aligning the C with the middle seem.