Well - you seem to have done all the right things. I would agree if the choke gets you to the barn it is likely to be a fuel problem. Before giving up I would suggest the following:
1) Add a fuel pressure gauge just before the inlet to the carb. This would rule out any restrictions in the fuel line, tank venting issues etc. I have found fuel filters do not run full - so that is not a worry item for me.
2) You have mentioned several times of cleaning the fuel inlet valve needle and seat. This valve typically fails by trapping dirt between the needle and seat preventing it from closing. This results in flooding rather than a restriction of fuel flow. If there is a restriction caused by a particle of dirt it would most likely be inside one of the carb passages. This particle floats around until it gets sucked up against an orifice (metering jet) causing a restriction of metered fuel. Stopping the engine can allow it to fall away from the jet - allowing normal operation - until it gets in the way again. I did the new fuel filter, added an electric pump etc. to no avail when I had a similar problem on my Kohler. The problem went away when I blew out the carb passages. To blow out the passages the metering jets need to be removed and use high pressure air, blow in both the forward and reverse directions.
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