I believe that you alreaedy download our BSEC 2, and using our example code.
1. There is fucntion bsecInst.setConfig(bsec_config_selectivity). You need to replace original bsec_config_selectivity with your own.
2. Please check our example basic_config_state.ino in BSEC 2. Nothing change from original our config. But, you can get gas estimate 1 ~ 4 depends on your setting.