You don't need to contact Jagex to get this information. You can find it out yourself.. Myself, having done barrows too many times to count.. I know that kill count doesn't effect your chances of getting armour or a weapon. It only changes the amount and type of runes you get. I've searched with 6 KC and have had many items and either deaths,minds or chaos, or more than one of them, never bloods.. With 15+ KC you get bloods, deaths and chaos nearly every search, never minds. I also got about 200+ KC about 5 times now, once i got a dmed with a massive KC so what the guy said above about 'Rare Barrows Item' being dmeds and half keys, is probably correct :) Oh yeah and every trip has been random, I havent yet noticed I've been getting more items with a higher KC than lower, and the other way around. Test this out yourself and you'll see... :D