For what it’s worth, going full-on lightning on my (numerous) Allagast mage hunter tests produced only unremarkable improvements, somewhat to my surprise.
Ultimately I feel that the Arcanist modifiers need some work to be competitive with Vindicator/Apostate/Purifier, and I don’t have much hope that general buffs to the mastery will change that. This is an example of something that would work, but skipping lightning DoTs for e.g. a further additional shard would also be feasible. I’m waiting to see 1.1.4.0 before bringing up the subject again.
I go “why” at the Deadly Aim support in the first place, to be honest. CDR with partial uptime? More global buffs to the Inquisitor side of the set, which already plays so well with other masteries?
Yes, it’s especially an issue on point-starved Allagast. Personally I’d consider moving the radius modifier to Death Sentence for those who use WoP as a debuff and concentrating damage on the first two nodes.