In the last few nights I was able to catch more data of M16. I got much better Ha data (better seeing) and also some OIII and SII data, that I had to stretch quite far). In the end I'm happy with the result (it's at only 20 degrees elevation here...).
TEC140 / QSI583ws
6x900s Ha, 4x900s OIII, 4x900s SII