There aren’t any settings in the file; you just got default PG settings when you loaded it into the GFUI (Glowforge User Interface), so I’d be taking your money for nothing, since you already know how to rasterize. 
If the engrave didn’t go as deep with the rasterized file, then you’d need to either slow down the speed a little, or increase the power. You can experiment with the settings on some of your scraps until you get them how you want them. If you do two rasters, one for each of the color sets, then you’ll want to test settings for both of them to get them to look the way you want.
Here’s a link to a really handy test strip you can use for dialing in your settings on a particular material: Has anyone been cutting 0.37-0.40 material?