Nice drive and pass by Redick to Nelson.
Run that 1-4 high post pick and pop until Howard finally fouls KG.
Run it again and again and again
Yeah, definitely, keep going at Howard defensively. 
Garnett is a great matchup against Howard offensively, he can make his life very uncomfortable with his shooting ability and ability to put the ball on the floor and drive. He has a matchup advantage against Howard. 
So, this is a good thing to do on both counts. Keep attacking here.