Originally Posted by JJeffrey

Really nothing to worry about. The only "unknown" is how long it will take your bags to come out.

The process: clear immigration with GE, wait for bags, exit customs hall, drop bags on baggage recheck belt just outside customs hall, take the elevators/escalator upstairs to departure level, clear security, then go to Soho lounge for any time you have left before boarding. Soho is just past security on the right up a level.

At JFK there's no shortcuts or anything else interesting. I suppose you can walk through the Flagship First check-in area just before securty but this isn't really any quicker unless the pre-check lines are long, which they rarely are.