Expedition in Maps - how to optimize Logbook drops ?

Hi, i saw some guys yt-video telling, they get almost 1 Logbook EACH map they run. But i cant find out, how they do it.

Did 30 x T 15 maps now, only 2 x i get Logbooks (1 x 1, 1 x 2).

In the atlas specialation i got the 2 arms to Detailed Records and Unearthed Anomalies.

I set my detonations to "increased Logbook chance" remnants, if i get it.

Then a mix of Remnants and Runic Monster (the BIG Flags, right? ). The "whirls" signs i dont pick.

And i have all "pack size" nodes in the normal Atlas btw

So, what am i doing wrong? Only bad luck?