Enter US doing "independent research" as listed as accepted under B1

I have a valid B1/B2 visa and travel to the US for some months, the idea is to stay 3 months in the US and then 3 months back in Europe, then US again, and so on, I have a gf in the US. I am employed and paid by a European NGO. As I do research/science, I was wondering if I could just run under the mentioned "independent research". Research could be directly related to where I go. I am not sure if being paid from a non-US source is a reason to deny entry. I am not going to do any research at an institution, just stay "home" and do my research there (online). I am aware of running into being taxed at some point (what probably implies -working- then) but for now..

I would tell the officer that I do vacation and also do research on this and that. Both is true.

Does this work ?