Buster Brown, hey first time in here
You have made some visual changes which is what its all about and I can see you growing, good idea to concentrate on the lagging muscle and hit it hard and intesne with some compund movements, Apply HIT and you wont go wrong push and make every rep count otherwise there is no point in doing it. Once you have come to failure and I mean complete muscular failure then apply either forced and negs or dropsets or if rest pause feels better take that route but at all times on your working set go to failure and beyond and personally the shorter the workout the better, once you have done the damage no need to be in there any longer, go home and feed
looking good, well done