I fuck around with a lot of fasteners. I do not even think of fucking around with bead lock bolts. I use an impact but I know very well what I am doing and I know that several things are true.
1- every time you tighten one bolt, it loosens the one on either side of it until it gets up to full torque.
2- none will come up to full torque until the lock ring makes contact with the rim's mating surface.
3- if the bolt ring cones too far, that will tilt the head of the bolt as it goes in and due to the hardened nature of grade 8 bolts, about 3/4's of a turn is all it takes like that to snap the head off.
4- bead locks are inherently dangerous. Each bolt has to perform at full function to prevent failure. Also why they are not recommended for high tire pressures.
5- never torque the bolts with pressure in the tire. If a failure starts, it will blow the bead lock ring off with enough force to ruin anything in the kill zone.
6- I only use the impact to move the bead lock ring down until it is just about to contact the rim or has just barely done so.
7- Did I mention that bead locks are dangerous as fuck yet?