With Skunknet you get almost no stutters at all for the other aircraft, even when you're using the unlimited FPS.
At least not in P3Dv4.
As for the lag, the plane appear something like 5 meters up to one plane-length behind its actual position.
Last time we tested, my brother and I were flying Tomcats at approx 300 knots. He brought his tomcat wingtip next to my wingtip (two-three meter away or so) according to him, but from my side, it was his aircraft nose which was in that longitudinal position.
So as I told you, we're not flying as tight as real spectacle formation. However, we can still stay in a reasonable range, which is fine enough for us.
My joystick will not allow a precise-enough piloting anyways (Sidewinder FFB2, with electrical supply disabled, so no center anymore), and I don't plan to replace it.
Locking at 30 FPS might be good for you because you fly on a screen. For us, this is not acceptable anymore.