On the topic of intelligence, Wes might require, I'd say, no more than another intelligence point to make it feasible for him to be working this extensively with explosives. I'd recommend taking one from either Wisdom (a little less wise than the average bloke, I'd expect, but that average wisdom would allow him to be surprisingly insightful for a big guy) or Strength (taking one point away would take him from being god-like/Mr. Olympia to bodybuilder and isn't too much of a deficit - unless you're real into min-maxing).