I've tally marked about 400 pieces of armor now while using the Gunner Armorer mod on my ghost. Here are the results: 72 Brawler, 75 Paragon, 79 Grenadier, 76 Specialist, 73 Bulwark, and 29 Gunner armor pieces. Something's clearly wrong. I don't know what "more likely to drop" means as per the ghost mod, but reducing the chance of getting armor I want is not what it should be doing.