Do you think 8 sheets of screen is too much?
Honestly, I've never done this so w/out actually seeing your tank it's hard for me to say. In this case, I would rather err on the side of caution. Three days of too little light will not kill your corals, but three days of too much light very well may. IMO
, keep 8 sheets, stick to your plan, and keep a close eye on things. If things start to go too fast, your corals will let you know.