FF 16

[Leoparis]

I'm not exactly sure why we have FF 16 after 17-FB.
Page 2 of FF 17 (panels 1-5) recaps FF 16. Those 5 panels don't all match with panels of FF 16 and some panels could be inserted between panels of FF 16 but that isn't necessary.
The new flashback is panel 7 page 2 of FF 17 which tells of how Princess Pearla knighted the Human Torch. This fb occurs after the end of FF 16. That's the only fb we need to take into account.

ANT-MAN/DR. HENRY J. PYM
FF 16
FF 17-FB
FF 16 (delete)
FF 17

HUMAN TORCH II/JOHNNY STORM
FF 16-FB
FF 16
FF 17-FB
FF 16 (delete)
FF 17

INVISIBLE GIRL/SUE STORM RICHARDS
FF 16-FB
FF 16
FF 17-FB
FF 16 (delete)
FF 17

MR. FANTASTIC/REED RICHARDS
FF 16-FB
FF 16
FF 17-FB
FF 16 (delete)
FF 17

THING II/BENJAMIN J. GRIMM
FF 16-FB
FF 16
FF 17-FB
FF 16 (delete)
FF 17

[Col_Fury]

FF 17 (2:1)-FB repeats FF 16 (12:3): the FF fall through a vortex.

FF 17 (2:5)-FB repeats FF 16 (22:3): Doom escapes via enlarging ray.

The rest is new, even if they're minimal. Here's how I would fit the flashbacks in:

FF 16 (1-16:2)
FF 17 (2:2)-FB (Doom & the FF)
FF 16 (16:3-20:2)
FF 17 (2:3)-FB (the FF)
FF 16 (20:3-21:8)
FF 17 (2:4)-FB (Doom, the FF & Ant-Man)
FF 16 (22)
FF 17 (2:7)-FB (the FF, Ant-Man & Pearla)
FF 17