The time for your question was before you applied ED. If you were not sure on finances and wanted to play the field then you should have applied RD. Applying ED is concession of control in return for an edge. You accepted that edge, and presumably read the binding contract you entered into. Now you have benefitted from that edge.
Assuming the online NPC calculator you could have run before applying is close to what Duke offered you then it is not time to play the field but to cancel your other applications as you agreed you would do if accepted ED.