The cards I have:
Citi Double Cash
Chase Sapphire Preferred
Amex Hilton HHonors
Amazon Visa (use this with amazon only)
Currently I have been using either the SPG and CSP exclusively. Should I be using the Citi Double cash now though?
I think you are doing well with those two cards. Assuming you use the Hilton card ONLY at Hilton properties and Freedom for 5% cats. I value the Starpoints almost higher than any other programs you have simply due to the transferability and bonus. CSP for all 2x & 3x cats and SPG for everything else not already listed. DC is a good alternative and you can't beat the versatility of CB, so you would still be doing well with 2%. Seeing how you stay at Starwood properties the Starpoints are where it's at.
YMMV of course.