I got a little bit of footage of loop vs block a few days ago. Little bit being two shots, because it was a test to see a quick thing.
I didn't try to whip my arm or anything, just swing normally, so I can see how my "real" stroke is. Using shadow strokes to judge timing etc. is a bit pointless.
The Koki Niwa / CCY match had a really nice angle at one point of loop vs block, so I did a comparison.
http://imgur.com/a/NOzpE
I'm not at all surprised that the main problems are a serious lack of timing in the body rotation and overall not enough body rotation, and a complete lack of whip. My shoulders are also a bit tensed, it looks like. I also noticed my right leg is very, very back during the backswing. I know it's like this vs backspin, but I never noticed I do it vs block. I feel that having the leg this back hinders my body rotation.
It's not like I didn't know these things already and wasn't working on them, but it's good to see a comparison to something more correct. I'm surprised just how much I really need to turn the body: that's some 45 degrees more just before contact.
EDIT:
Back from today. About 4 hours of TT today, a bit on the light side.
I'm really putting 2 and 2 together in terms of footwork and topspin contact. I now feel that I "get" it and I'm purposely doing things how I want, contrary to half a year ago. Staying lower than usual all the time and squatting has really conditioned my legs and back, it's not nearly as hard anymore. Part of it is mental too: I've just got used to "harder work".
What do you guys think about Stiga Allround Classic with Friendship 729 Super FX on both sides for a beginner setup? My friend I train with has used my setup and can do okay with it and is used to the rubber, so I'm thinking of staying with the rubber that is familiar and affordable to him, but a slightly slower blade. He is a beginner of a month or maybe two soon. We drill together and I instruct him.
It's his birthday soon, so I might even pay the sheets for him so it'll be a nice deal on his part I think.