5 bandit signs in one location? Thats not a lot.
I have put out 25 and received minimal responses. IMHO you have to go big with bandits. I usually buy from banditsigns.com and use the "sell your house in 48 hours or less" bandit sign.
I'm a bigger is better kind of guy so I always order 18 x 24's and use 30" inch wire stakes but that doesnt mean smaller sizes dont work.
The other unknown is where are you are placing the signs?
They should be in very high traffic areas where people have to stop and see them. For instance one of my favorite areas to place is on 6 corners of a very busy intersection that has a Lowes, Target, Old Navy, etc. Well trafficked during the weekends and the weekdays.
Others may agree or disagree but i think bandit signs are a numbers game and the more is better rule applies to this method of marketing.
I made a bandit sign order last week for 50 bandit signs. I wish I ordered 100.
When I get them i will put out at least 25 minimum in a 10 - 20 square mile area