I try to create weapon grits with 7 assault, 1 pride and 2 defenders. Not counting doble skill weapons.
For SR weapons, I use R weapons untill skill level 10, then I use R weapons to level up SR weapons I dont use, and later use that one to skill up the weapon I really want to use. The required R weapons are from gem gacha.
That is how I do it. Is totally possible that more experienced players use other grits. I think many people use directly 10 assault weapons, but I like to have a bit more defense.
Of course, all the weapons of the element of the team. Weapons of elements different of the Kamihime of the element no increase skill for those kamihime.
Edit to clarify: Pride weapons have a variant of assault that give more attack the less HP you have.