Here's my effort at 5X9.
Points I've focused on:
1) Lifting the heels off the ground do I don't use that leverage to start the curl up
2) Pressin the low back to the ground (like with FL/PE1) to start the curl up with muscular effort (trying to minimize momentum)
3) Attempting to crunch up as much as possible at the top (torso compression and knees close to chest).
Problems I see:
1) There's something off with the torso/leg coordination
2) Are the knees coming close enough to the chest? I have a long torso so inadequate compression could be the issue here
3) ???
Thanks in advance for any pointers!