Square 8s are always a challenge but I watched a couple of video clips that Derek Barry filmed of Orestes Hernandez doing some stunts and I saw how he keeps his arm out in front and uses the handle to fly. I, like may others tend to jerk my arm all over the place and today whilst flying was trying to stay focused on arm, fly with handle (not arm jerks), smoother full arm drawing of maneuvers, coming back to center of chest (saw Chris Rudd doing this). Wow....a lot to think about while flying
Overall, looking pretty good, you are really starting to get there.
To offer some observations - it looks like the airplane doesn't turn very well outside. They triangles are pretty good and with a decent shape. The square 8s are acceptably square on the inside parts, but soft, bordering on rounds with flat spots, on outsides. Same with the top of hourglass, which makes it much more difficult to keep the top and bottom the same length. Thats why you are having double trouble on several examples, the third corner is to soft at times that you wind up way over to the left and too low to make a decent down leg.
I am not sure what is causing it. It's possible that it's just you, but based on other examples of very similar issues, probably not. I would suspect that you have some neutral bias in the handle first, and in any case, it would be worth just shifting the neutral towards more down (i.e, lengthen the "up" line or shorten the "down" line) and seeing what happens. But if is seems like you have to use a lot more handle force for down than up, you might want to dial in some down elevator at neutral flap instead. And, as always, if you haven't sealed your hinge lines, do that first!
Your are doing the right sorts of things and making good progress, so, very well done!
Brett