I don't really get it. Phy.Atk.Pwr ist important and Crit is important as well. In the end it's ur own choice what u prefer.
Keep in Mind that +0% ist always bad^^.
To your +X question. Well... I would say, if u got a small gap, u dont really need to enchant your eq. cause u are lvling up fast and will switch to higher graded weapons faster as well.
If u got a high gap, cause u are farming or something like that, enchant your eq. and weap. Hope this helped