Hey since you Modding the arms why not cut the ends off and put hyme joints on the ends. Be well worth it for added flex
Zero to 1 degree neg camber is good. Neg camber will help with turn in, as the outside tire flexes through the sidewall when the weight transfers across the front. With the tire leaning in slightly, the tread surface will stay flatter for longer. If you can afford them, put air bumps on the front beams to help the upper end of bump travel.
By their very nature an I-Beam front end creates negitive camber as the suspension compresses and increases caster, so with body roll the increase in caster and camber help to keep the tires contact patch on the ground.