This ended up working best for me. I definitely needed to fulcrum it up as pulling by hand didn’t budge it. Initially I used the 3d printed inserts but not sure how those were supposed to help as it made the ends point more up instead of down? I removed them entirely and it all fit into the tracks without any resistance. I decided to reinsert the oem plastic pieces to see how it might work. Similar to this post if I insert the passenger side first and apply a little pressure driver side it works out.I, too, had trouble installing the cargo divider. I was able to get it to fit over the sub-vault hatch, but not over the fixed portion of the vault floor. I estimate that the cargo divider latch bolts were 2 mm too high to slip into the L-track holes when it was placed on the floor ahead of the hatch.
I liked your approach to solving the problem and gave it a try because seemed like it involves the least amount of time and effort. I loosened the 6 bolts that attach the inside vault panel/L-track. I took out a 10mm head bolt and looked to see if I had a similar situation as you, and found that I did.
I couldn't budge the side panel upward by hand, so I used a fulcrum and lever to apply lift to the tie downs (see photo). This worked great on the driver's side. I was able to raise the panel a sufficient distance. That's not the case on the passenger side. I raised that panel a millimeter at most.
Still, having done this, I'm now able to insert the cargo divider ahead of the sub-vault hatch. I insert the divider into the passenger side L-track first, then pushing the driver side down, I close the latch. It's a tight fit. Not the ultimate fix, but good enough for now.
