Thanks for comments and suggestions guys.
I know what you mean about the plosives - I think I was standing too close to the mic, but didn't notice the effect till later. I thought about doing the vocals again, but thought it would be too much effort! I'm lazy 🙂
I think I might try your suggestions. To be truthful, I've never thought about tuning snares for a particular song, but it probably makes sense. Would you say the tuning needs lowering? And I know what you mean about leaving things for a while, then returning - it's quite surprising how different things can sound!