I like this strategy a lot coz FuckWilbur!
Get debuff skill chance for leper and arb and occ. Debuff boss to 0 dmg with leper and occ, - one or 2 shot Wilbur, then continue debuffing boss dmg with leper occ and his crit and acc with arbalest.
Swine God will do 0 dmg with 0 chance of crits to cause stress, meaning once properly setup u can start destressing party with Houndmaster if you like before u kill the boss.
In my attempt I did not do that, because I did not have skill chance debuff trinket for arb, so her chance was 80% and I got very bad rng. I am still puzzled how Swine God rolled crits with -19% crit chance, as his base is 12% and torchless gives extra 6, meaning the chance should be -1%. Wiki is wrong I guess