I understand from the Flightradar site that the FAA side of things may have a delay factor, but most things that pass overhead by me (GIBSO) are pretty much spot on.
Correct. Real-time FAA radar data is only made available to a closely controlled circulation, and needless to say that doesn't include the enthusiast community.
Data derived directly from the network of ADS-B receivers is normally distributed with little or no delay, other than the latency of the networks, although when such receivers originally became available 7-8 years ago they did incorporate a 5-minute delay (now removed) to the external data stream intended to power client applications.