There are no "tricks" to getting hydraulic NPT fittings to seal, unless you are dealing with "black pipe" style NPT fittings, such as straight connectors, bushing, couplings, etc, as most of these don't have the taper incorporated in them. In these cases a sealant such as pipe dope must be used. These type of NPT connections are not leakproof without pipe dope. As you had said, the seal on other hydraulic NPT fitting is on the taper. Both male and female must be "hydraulic" NPT with the tapers. If one fitting is standard "black pipe" NPT, they won't seal no matter what, as a lot of these don't have the proper taper. Obviously "black pipe" NPT should not be used on the high pressure side of hydraulics, as they are not rated for the pressure. As you mentioned, once the fitting stops swiveling, (unless a "live" swivel), the connection is tight and should not leak.
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A typical connection on a hydraulic NPT swivel 90 or straight, is a hydraulic hose male npt to the female NPT fitting. In this case the male NPT hose has the "chamfer" and the female fitting has the "cone". If this is what you have, and they leak, one part or the other is faulty.
Note that some "older" NPT hydraulic hoses, are "black pipe" style, that is no chamfer. As said previously those won't seal no matter what.
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