low DLI or just genetics, bud. keep the plant healthy. there is no magic product or magic technique that will do what you seem to perceive it should.
easy to know if you cause a re-vege... did you interrupt it's dark cycle? It does not take much. Never interrupt a photoperiod's dark cycle. the non-serated leaves might be the result of a re-vege but there'd be other symptoms too.
Plant looks overfed, but might be the lighting playing a trick too