Nebit, Dathcha and Jawa all work well with 6 health mods, ideally with protection primary on circle, cross and triangle.
Engineer probably best with speed and health, but again protection primary on circle, cross, triangle.
Scavenger can depend on the level of your Jawas. If they’re all up in relics (which I doubt will be the case for you), then speed and potency mods are best with a potency primary on the cross. If your Jawas are low-geared, forget speed and make Scavenger tanky with health mods - protection primaries again, though you really do want potency primary on the cross mod.