Well, NL has a point. Some things that Waldner did would give coaches grey hair.
I still believe that a shorter, more compact backswing by only moving the elbow closer would be beneficial. I think he is very prone to swing from the shoulder with the current method, and we need to consider how he will deal with a fast counterloop into his middle, or a punch block right back at his forehand. Even pretty low level players are capable of such things if they're used to playing against spin, so it's a concern.
Take what I say with a lot of salt, I'm a fairly low level player without coaching. I'm just sharing my own experiences, because my rally swing is very big for my height and I've had to really watch these things. You're free to disregard everything and correct whatever you feel isn't quite right.
Now for my day's chitchat:
Everyone played fantastically today. I slept a total of 3 hours and I don't think I've played better in my life. It could just be the sleep deprivation making me think so, but I'm not too sure.
My loops are starting to get blocked back pretty fast, pretty low, and it's really developed my footwork and confidence in being able to consecutively loop many blocks and even some counterloops. Actually had some very respectable games today, alternating looping and blocking and having to move in and out when people dead-block my loops. Some guys I play with have good hands, and they can control my loops fairly well because I'm fairly predictable.
Now when some guys have really learned to put spin on the ball with enough racket head speed and the right touch, I've got a chance at improving my block, too. I can close the angle to 45 degrees and sometimes even more, and if I have soft hands and push forward a little, the ball will go over with quality. Before, it would just be a net, because there was no spin at all.
I'm sure it's not even 1300 level play, but it sure is dynamic.