Rinc between the ships is 0, so no problem there. Check out the difference in TrLs in Orbit MFD, then look at the DLng number in Sync Orbit MFD. For some reason Sync Orbit thinks the ships are a lot further apart than they really are.
I've been using Orbiter for a while now, and I found that Sync Orbit MFD is flaky; sometimes it works, sometimes it doesn't. I'll usually try to check it against something else. Orbit MFD is reliable, and if it disagrees with Sync Orbit's numbers, I'll go with it.
This will give some of the purists a hemorrhage, but since the target craft in your scenario (GL-01) has a very low eccentricity (0.0001), you can just treat its orbit as circular and assume that its angular velocity is constant. Its orbital period is 5245s, your orbits are aligned and it's 0.18 degrees TrL behind you, so it needs to go one full orbit + 0.18 degrees to get to where you are now. Which means if you set your orbital period to 5245s * (360.18/360) = 5248 seconds, you'll get to that point in the orbit at the same time GL-01 does the next time around ... and looking at your Orbit MFD numbers, I see you've already done that ...
Danny