Without going to the linked sites I'll add my $.02. If you not use the shift levers to work the der during it's adjusting process you'll learn the separation between the der's movements and the shift levers control of the cable.

Meaning- do all the der positioning, limit screw adjusting with pulling on the cable midway between the frame casing stop and the BB shell guide. This way you end up with a der that works independent of the shift lever's part of the system. Then go back and start to use the shift lever and establish the cable tension that allows the lever to move the der through the previously established function.

The inability to look past what the lever does and see what the der needs is a common challenge for inexperienced wrenches. By separating these two aspects of the system the understanding gets better faster. Andy.

PS- And if the bike has internal cable routing then it sucks to be you . Really (and not a joke) with internal cable routing every thing about der work gets a lot more involved and needing to be spot on/perfectly performing. This is when one should consider letting a pro do the work.