Ahhh that sounds amazing !! Ok so a few more details.
We do have the ability to float money around as you detail. We also can spend free and clear 2+k per month on the cards on normal spending (gas, food, whatever else). Currently we do this on our Discover card. I figure we could do better after reading a lot of these forums ! I suppose I could also sign up to pay some bills with the cards ? Or do you guys not bother with that ?
I am not sure I understand the "manufactured spend" but would be glad to read up on it. I am guessing you are talking about for example how I read that you can buy dollar coins with your credit card and then just go deposit them in the bank or spend them ? I am not familiar with other examples.

My only concern is how you mention opening a card, then closing it. Doesn't this activity look bad on your credit report ?

Thanks so much ! I am very excited !!