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So how about posting some here for us to peruse. The more data we have the better. Ideally Slat development AOA's .
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This is Bf-109E-3 V24 WNr 1929 from April 1940. The report is titled, "Drag and Measurements" and this polar is the aircraft in "normal" condition.
"Normal" by RLM definition means it was a little worse than the finish of an aircraft just off the production line and is intended to representative of an operational aircraft in mid-life. Sort of like the USAAF's "combat weight" (~60% fuel/oil) is intended to depict an operational aircraft encountering the enemy during the target portion of the mission profile.
The polar gives excellent agreement with the RAE measurements. It takes the Clmax out a few decimal places from the RAE report (~1.45), refines the opening CL(~.84), and gives you the 2D AoA(~17.5 degrees). The slats begin to open at about 8 degrees and are fully deployed by ~11.5 degrees. The wing is stalled at ~17.5 degrees with the body angle of course being the induced AoA + Angle of incidence.
It should help considerably.