Silvaire1
Slow taxing is OK for small aircraft but it won't work with some jets, the high residual thrust sees to that!
The reason for the excess thrust is usually because the engine idle speed is determined by the minimum speed that the IDG or CSD ( the constant speed drive for the electrical gererators) will keep the generators on line.
I have described the recomended taxing technique above, you have to do this because you can't just taxi slowly without riding the brakes and that results in overheating.