So you meant $400+ "cash equivalents" bonuses and not $400+ cash bonuses as I suspected. For the benefit of the forum members it should be noted that all those cards carry annual fees. The CSP is the only card on your list that gives a statement credit which is essentially the same as cash; the 1:1 transfer is good but, not a good everyday card for me though. I don't use Citi, but I'm pretty sure the TY points can only be used for gift cards and not cash, but maybe not. Travel credits are not the same as cash and are subject devaluation.
If you're churning Chase, then you're already lowering your credit lines after you get your cards. This makes worrying about "wasting" the credit Chase will extend you a moot point. Also, if you're at your limit as you infer, it's extremely easy to free up space (you only need $500) by lowering one of your lines.
As I mentioned previously, it's a no-brainer to get the Disney Visa for the $200 bonus with no fee and only a $500 spend; regardless of how many other Chase cards you have or your churning stategy. Now, if you're not really worried about wasting available Chase credit and are actually concerned with too many hard pulls from the same credit bureau, then that I can understand. With Chase, you're eligible to receive the same product sign-up bonus two years after you initially received it (not when you applied for the card).....plan your hard pulls accordingly.
BTW, something tells me you'll have no problem earning enough points to upgrade those econ tickets to business class!!