I would suggest dropping your shipping to $1.50 since you can get quite a bit of stuff in a bag for $1.50
I charge $1.00 for PCBs and $2.50 for entire strobe tubes.
Then, probably drop the opening bid to $0.99 and see if you get any hits.
You are paying to list your products, so if you don't get any sales, you will know that you are charging too much.
It looks like you have hundreds of auctions going right now, so in about ten days, you can look at the success rate and see if you are getting anywhere. THen lower the prices on half, the shipping on the other half and wait ten days and see which made the sales come in better.