7747 on a Ford 400 - still not getting a backfire issue sorted

[Dr_Grip]

After sorting out the general setup, my ignition timing and DFCO with the help of this community, I sill can't find a way to tune out an rather elusive backfire trough the intake.

The issue appears only when accellerating from a cruise speed of slightly below 30. I don't have the problem at higher speeds, lower speeds or when flooring her from a standstill. The fact that it only happens during a small speed/rpm window makes the issue hard to reproduce. In accordance with Murphy's law, it seems to only occur when I really need instant throttle response to start an overtake or catch a yellow light :)

I attached my bin and the log file to this post. In the meantime, I already adjusted the VE table to get rid of the 135 BLM seen in the first screenshot.

EDIT: Triple-Checking, the TPS values do not seem to change enough for this being the right point in the log... But it has to be right after I left the Autobahn, so the general time frame looks right.

This is the last data point before the backfire:


This is almost the exact moment of backfiring, note the INT value going crazy:


And this is the data point after:


Here's the monitor view, as well:


Any help, as always, is highly appreciated!

Here's a pic of how she runs when she does not backfire :D