Random is random. That you experience worse loot with low luck characters is just... random... or confirmation bias on your end. Here is a funny story about random from when I first introduced caves with special loot: There was a 35% chance to spawn a cavern encounter instead of mountains, a 5% chance to turn this cave into a mining site encounter, and a 15% chance to spawn a weapon loot crate inside the mining site, which had a 1 in 30 (or so) chance to spawn a Bozar. So I start a new game, travel to Shady Sands, suddenly get into an encounter, it's a mining site and it has weapon loot containers and in that container is a bozar...... on my first try, at level 1, and I played for less than 5 minutes...... That's the beauty (or curse) of random. This never happened to me ever again.