I'm new to atties too, but after trying out several of IKV atties they've all worked like a dream right out of the box (HV i06 3.5ohm, as well as LR & HV 510's and LR & HV 901's all in 1.8ohm, 2.5ohm, 3.5ohm, and the new 1.5ohm 510 XLR as well).
My 1st experience with an atty (a LR SmokTech)...