Photoshop not printing correct shade/opacity

Hey everyone, I'm going to try and explain as best I can to get the help I need. I'm trying to create a sign for work with a star pattern in the background. I created the shapes in a group and dropped the opacity of the group layer (see image candy bar sign 2). When I printed it though, it came out much darker than what I was seeing on the screen. (See candy bar sign print 2). I had to drop the opacity so low you can't even see it on screen (see candy bar sign 1) to get it to print how I want it (candy bar sign print 1). 

I could leave it as is since I finally got my desired result, but if something ever happens to me or I leave my role, someone may need to update this sign in the future. So I want to help make it easier to adjust and know that the stars are there if someone doesn't have as much photoshop experience. So is there something I could be missing that's making this print so much darker than my screen?

These are all the things I've tried and tested:
1) Made sure group layer was the only opacity dropped and not the individual images. Still printed darker
2) Raised the group layer back to 100% and just adjusted the shade of the color to match what I'm going for. Still printed darker.
3) Created the star pattern as a brush, adjusted the color to what I wanted. Painted it on the backgroup. Still printed darker.
4) Same as 3, but dropped the opacity of the paint brush. Still printed darker.

Thanks for any help.