The following video demonstrates the swing patterns we've been practicing. Your consistency will improve dramatically if the height of your 'down swing' replicates what you see here in the Andy Murray forehand visual, rather than the height shown in the video. Note as well how focused Andy's eyes are on the incoming ball. Very important.
FOREHAND IN SLOW MOTION
THINGS TO NOTE:
Eyes focused on the ball
Left elbow pointed in the direction of incoming ball
Racket in the ready in preparation to go low - then through the ball - arcing freely - finisiging in a wrap high around the shoulder
NOTICE HIS HEAD REMAINS STEADY, NEVER LOOKING TO TO SEE THE FLIGHT OF THE BALL THROUGHOUT THE STROKE after he drives it
Chin lands on the right shoulder at the completion of the stroke.