I'm having a number of problems with shiny hot spots on peoples faces when photographing school formals/proms. The area that I live in can be quite warm and humid and it's becoming very time consuming fixing it up in post. Does anybody have any recommendations in regards to lighting to either prevent or reduce this. please. Currently I'm using umbrellas either side of me at about 45 degrees to the subject but have thought about using a pair of softboxes and feathering them, any thoughts ?