https://oldschool.runescape.wiki/w/Chambers_of_Xeric
Read that fucking moron
"For every 8,675 total points obtained, a 1% chance to obtain a unique loot is given. This chance is capped at 65.7% (570,000 points) - any further points will be sent to roll for a second unique loot. For example, a team who possesses 855,000 points in total has an 65.7% chance to receive a unique loot, and then a 32.85% chance to obtain a second unique loot.[1] Up to three unique rewards can be obtained per raid, assuming that there are enough points to roll for them.
If no unique loot is obtained, random resources are chosen, with the player's points determining the quantity of the items they obtain. In groups of all sizes, a weighting system is added when a unique loot is rolled, based on the players' points. For example, a player who has 90,000 points is twice as likely to obtain a unique reward compared to a player with 45,000 points.
Once the game has chosen which player will receive the unique loot, an item is chosen from the table below. The higher the weighting, the more likely a player will receive that item."
You don't need to meet a thresholds that you statedto be eligible for a unique, you just need to meet the min points required. Nor can you get a unique in your name with 0 points. What you said about blowpipe outdpsing dhl is just bullshit.