Raids on Bs is not directly taken from OSRS. Shirou, and myself have tested this. Shirous alt with 0 points got an item an item on more than one occasion, the account I used that had about 1/4th of the points got far less drops than shirou and more drops than his alt. If raids drop tables were mirroring the same as osrs, a drop wouldn't be granted. Right now I have 271kc on raids, I have 26 items. I mainly do solo/duo raids, and I have 26 items with 5 mega rares, you're telling me that osrs has a drop chance of 1/10 for a duo? Believe what you want. BS and OSRS raids are not the same. Otherwise there wouldn't have been tweaks to it to make it more similar to osrs raids. Because they would already be the same.

Also if you wanna prove me wrong, I know for a fact that blowpipe with ddarts out dps's DRL at olms hand on BS, we can go test that out as well if you would like.