Whatever cards you have just must pencil out in the end. For example, CSR gives 1.5X redemption while the CSP just gives 1.25X so with essentially a $300/yr fee ($600 - $300 travel credit) you need to run enough through it it make up the extra $200 (CSP is $100/year, right?). So, you'd need to run roughly 80K through it (or other Chase cards and xfer points to CSR). There's nothing inherently wrong with having multiple cards as long as they make sense.

I don't really put a huge amount of value in things like lounges, buyer's protection, TSA PreCheck, etc. but if it works for your travel patterns that is another thing to look at.