If you had a very difficult feeder I would recommend every 7 days to get responce up. I do not think feeding every 2 weeks would cause an issue. The snake should still grow and have enough nutrition to perch all day and roam at night. With that said, I do not see a problem with feeding an adult every 7 days as long as the animal is acting normally and not obese.
Green trees will dangle the lower part of their tail to attract food in the wild. Notice, it's a different color. Typically black, my PNG is blue. Try a day time feeding. I get off work around 5 and go home and feed without any issue. Offering multiple meats together will stress the snake. I strongly recommend at least 3 day break before your next attempt. Moving the mouse across the cage might help create a responce.
as you can see, asp and myself have different methods. I wouldn't say either one is wrong, so many people do it so many different ways and a lot of them seem to work out fine. Hit up moreliaviridis.yuku.com and you'll find a ton of information a long with people more than willing to help.
Edit to post on asp, who was typing while I was.
It's a biak type.
Cheapest light you can get that he can not see (debatable) is a standard red light for heating.