1,1,1,1 would be a 50% chance of having Tier 3 or Tier 4, when the odds are that tight RNG can seem skewed as no RNG is perfect.
After doing tons of testing with this mod over the past couple days, I have found a bit more insight into my problems with this mod, or maybe the problems with the way SPTarkov spawns the bots.
It seems like it picks a tier based on the odds in the config for USEC and another tier for Bear pmcs, but only those 2 tiers. So what you see in raid would be like only level 1-10 bears, and level 31+ USecs, or level 11-20 USEC and 21-30 Bears, etc.
It doesn't seem like it's possible to get more than 1 tier in each raid for both factions.
Is this expected behavior? and if so, is there anything we can do that can make it more unpredictable? I would love to encounter multiple different tiers of pmc bots in the same raid as this would be far more unpredictable and more like the live version of the game.