I think on the later trucks, like yours, the Fp - B+ jumper does bypass the CO relay contacts instead of turning on the CO relay as happens in the earlier trucks. If so, then yes, the CO relay is out of the picture. One thing you could try is hooking up a voltmeter or light on the fuel pump power wire to see if indeed it is getting power (or not) when you have trouble starting. Or you could rig up a fuel pressure gauge and see if you are getting fuel pressure (or not) when you have trouble starting.

BTW: As I recall, the CO relays usually run well over $100, which is the main reason I did not run right out to slap a new one in my truck. The test jumper worked fine for a few years and recently the problem seemed to have fixed itself, been running w/o the jumper for over a year now w/ no starting problems.