the last 50% of jet thrust is controlled by the last 20% of the engine RPM
wherein lies the problem .. it all happens very quickly
or that u say I dont know about it at all?
comment was generic .. certainly not referring to your specific knowledge base
perhaps falling below Vmca/Vmcg - by increasing thrust.
if the takeoff speed schedule is low (typically associated with a very low weight takeoff - eg positioning flight), a rapid ramping up of thrust during the intial takeoff sequence may result in a thrust overswing (depends on the engine characteristics, naturally enough) and a sufficient increase in the real world Vmc to provide undesirable results.
The better routine strategy is to set the thrust at the start of the takeoff roll and leave it for routine failure situations. Perhaps you're a much better manipulator than I .. I always found I had quite enough workload without playing about with the throttle setting as well ...