I sorta agree with Anil. SVers usually struggle on return games, especially against nowadays power hitters, or worse, speed demons.
I actually happy that you were able to be so close to Alex, who seems to be a very hot player right now.
I also believe that SVers must risk about 50% of returns and generally go for more on return games. If you have the opportunity to hit the ball on return games, by all means hit it and make it count.
I would be concerned if you said you had tough time holding your serve.
As for half volleys by SV players, well, they hit many, many, many of them

Rob is very good at half volley, maybe he will better explain this whole thing then me

Rob ?
Level 13 Edberg and counting...