Do you have a preferred flux? Why?
" Even in a well ventilated space it can be an obnoxious odor."I usually use candle wax or other such wax. I have used sawdust. I usually use the wax.
After is starts to smoke well, I touch it with an igniter to burn the fumes. I get a less smokey space that way. Even in a well ventilated space it can be an obnoxious odor.