Yeah, but that means spending other materials I need elsewhere, so not an option. I have these glimmer earning buffs... but they don't work anymore. They used to give a large amount of glimmer on random headshots... now they barely reward anything you wouldn't get when not using the buff.

That's fair, If you're not wanting to use other materials. Maybe this can help speed it up for you. Still not enough Glimmer? Here’s a quick combo to use with your Ghost’s Glimmer Booster Mod. In the second slot on your Ghost will be a mod called Expert Hunter, allowing you to scan chests up to 75 meters away from you. Apply it to your Ghost Shell, then head to your planet of choice. Most prefer the EDZ since it's jam-packed with chest spawn locations. That’s not bad, but we can do a lot better. It’s unknown if this is a bug or a feature, but peering through the scope of a sniper rifle extends that 75-meter radius to basically the entire map. Suddenly, every treasure chest in your current area will be visible, with the only caveat being you have to now have to painstakingly correct your Sniper Rifle’s aim to be in the general direction of the chest to spot it.