With regards to the CSP, you can cancel it 30 days prior (or product change) and then just reapply and do the double dip. That's the real definition of churning right there

As a matter of fact...I'm not sure why you haven't already PCed that to a Freedom card? lol! Your husband has a CSP AND a CSR...there's no reason for you to have a CSP too. And when your Husband's CSP comes up in January I'd PC that to a Freedom too. And don't forget to cross-refer each other where applicable so you earn those points too.
If you want to accumulate as many URs as possible then stick with the dates I laid out. If you get more aggressive you could risk shutdown which would be devastating to your goal. As outlined above, you could earn almost 500k in URs in the next year! That's about as good as it gets!
If you need some extra cards...then putting AMEX MR cards in there is good too. You could get a BB+ and then refer husband to a BB+. Same with BGR, Biz Plat, Biz Green...
Keep in mind though, if you get 10-12 cards in the next year...you will eventually start to run out of cards. Take your time with the MSRs, maybe do some PC to freedom cards and take advantage of the 5x categories. At the end of the day - do what you feel is best, but the plan I've laid out is SOLID in my opinion and I spend WAY more time thinking about strategies like this each day than I should... so I know what I'm talking about hahaha!