Bad Look from IO when Leaving Suvarnabhumi

Ok guys before you start laughing here is my story. I am new here and need your help for my return.
I just came back from a 9 month stay (on new European passport)in Thailand on Multiple Entry Tourist Visa earlier this year. Made border runs as advised on this site using land borders (no problems). Before I was in the countryaround 2016/2017 for 3 monthsand 2015/2016 for twice 60 days. Well, as my title says the IO was not very happy and scanned my passport twice, shaking his head and looking at me like <deleted> but did not say a word. Is flying out Always safe?
Now for my return I plan after a few months out to return on Multiple Entry Tourist Visa (Europe) and do the entry via Nong Khai or Songai Golok (exotic but maybe an advantage)?I plan to transit via BKK to pick up there the 20K baht (will have return ticket etc for land border as well). Safe to transit in BKK? Any problems at land borders when coming with 2 large bags over the bridge?