Archeology; Luck is for when you open the chest, i doubt it changes anything when entering, tombs are random.
Crafting; The number of bonuses is determined by the runic hammer you are using, plat should give 6 bonuses and toxic 5, but i think its bugged and you only get 5 even with plat. A crafting suit is a good investmment, the higher the skill, the higher the bonus value should be, and i say should!