LogFAQs > #942282613

Ok did a little research on the sub stone grid

Element Match

Substone non-matching element = 10% of substone stats
Substone matching element = 15% of substone stats

Weapon Match - Gives the listed bonus stats based on the characters base stats

In the Beta the character had to match the weapon type but now it just applies to all characters so now there is no ambiguity about it. The best strategy is to equip 9x of same weapon type (if possible). Here's the known bonuses of full weapon grids

Wearpon - (HP% / ATK% / DEF%)

Sword - 25/10/10
Longsword - 14/18/14
Dagger - 15/10/20
Dualblades - 10/17/17
Martial - 18/14/14
Gun - 16/19/10
Longstaff - 8/18/18
Spear - 14/10/20
Axe - 15/22/6
Bow - 20/14/10
Staff - 22/13/8
Artes - 10/10/25

Instrument/Hammer/Support unknown right now