I have solid strokes and solid mechanics, but I'm having trouble keeping the ball lower over the net. It's always high and loopy especially when I try to hit a winner and put some racket head speed. All my friends are starting to hit heavy topspin and low trajectory. Hitting straight winners. How can I do this and not be the weakest player in the group. I don't want to go to low like a flat forehand with high error rate, but about a foot or 2 over the net. Please help guys, you always pull thru for me, could really use some help. Struggling a lot and leaving practice court frustrated and wanting to give tennis up.