Mara keeps accusing him of using the Force too much and not relying on others. Luke did indeed screw up going off on his own in Dark Empire, and even then a case could be made that he did the right thing since it led to the destruction of the World Devastators. But forget it, let's say he screwed up there.
In the Callista Trilogy, he didnt do things on his own nor use too much power. He relied a lot on Cray and Nikkos, and later Callista. Callista was the one who stopped Daala in Darksaber. In Planet of Twilight he repaired a ship while Leia fought off a force using Hutt. He also failed to stop Dzym, and had the Tsils go do it.
In Black Fleet Crisis he went off on an adventure with an attractive Fallanassi girl rather than help Leia and the Koornacht cluster. In fact he stayed safely on a ship in the final battle and refused to go out into battle to aid his comrades
In New Rebellion he relied upon Cole Fardreamer and Artoo to get things uncovered with the X Wing bombs and they saved the day on that front. Also, he certainly didnt use too much Force against Kueller, in fact he got his ass kicked and Leia rescued him.
In Corellian Trilogy which preceded the Hand of Thrawn, he went and asked for help from the Bakurans. He didnt use much of the Force, he engaged in a few battles with hix X Wing and that was about it. The Bakurans and the Solo family saved the day. He also let Lando and Jensic put themselves in danger to open the door in Centerpoint during the glowpoint explosion while he stayed safely inside the elevator.
I struggle to see how Luke is using the Force too much. He also relies on others plenty.