I'd greatly appreciate if someone could help educate me on how to interpret the inventory tables on EF. I'm a Diamond member with an upcoming flight booked in D inventory and I'm trying to maximize my chances of an upgrade to F.

I fully understand what all the various buckets (letters) represent, so no help needed there. But I'm less clear on what kind of inventory configuration is most likely to result in an oversold situation. My flight is coming up in about seven days and there's no cost to switch to a different aircraft.

Here's what it's looking like at the moment on the two days I'm able to depart:

1.) F4 A4 J9 C9 D8 I6 W2 R0 E0 Y6 B4 H2 K0 M0 L0 V0 S0 N0 Q0 O0
2.) F4 A4 J9 C9 D9 I9 W3 R1 E0 Y9 B9 H9 K9 M9 L9 V0 S0 N0 Q0 O0
3.) F3 A3 J9 C9 D9 I9 W4 R2 E0 Y9 B9 H9 K9 M7 L0 V0 S0 N0 Q0 O0
4.) F2 A2 J7 C7 D6 I4 W9 R5 E2 Y9 B9 H9 K9 M9 L7 V0 S0 N0 Q0 O0

I'm assuming flight #1 is the best option given Y and PE inventories, but then again the business cabin of flight #4 is the only one that's starting to look tight.

Any suggestions?