20 fluence is a good number to start with the session. My derma was more conservative, she started at 18 na fluence pa nga ata
The most important thing when you go back for your second session is to make sure nadadaan buong underarms mo twice or thrice. I think depende yan sa size Ng underarms mo, if you are a big girl, you will most likely get more shots.
As for the burnt smell, normal yan for lightsheer na older model. Parang there was no burnt smell with the lightsheer duet, and even now, with the soprano xl with skin house clinic.
I'm sure the therapist shaved your underarms, with the older lightsheer, the hair pops out kasi. The pain is tolerable naman diba?
I'm not sure about the burn incident with skin station which is the former Godiva, and I've read a lot of negative feedbacks when they were still offering ipl.
You can try the clinic I go to if you went to facial care center. I'm getting good results with the diode laser, same machine FCC is using.