I know next to nothing compared to most of the folks here, but I'd hazard an opinion or two as I am online and doing nothing much of consequence.
1. Yes, it is your O/C expressing itself

. My experience with center channels is minimal, but if it sounds good without the center, let it run that way for a while. In the meantime, save up for that Wilson WATCH (I don't know what that is, but it had better be awesome for $5K). I'm sure most people here are going to tell you that you need to get a matching center anyway.
2. Again, I don't know much about subwoofers either and you didn't ask for an opinion but based on what I've read, I have a feeling that you might have done better for the money on your sub choice. Now if you auditioned this combination and found it to work great with your speaker set up, pardon my suggestion. Ultimately, if you like what you hear, all is well.
Finally, welcome (I should have said that first).