Sadly, even the JP Wiki doesn't say anything about it. I know that's far from accurate but I did a little experiment with a Light 60 Lightning Espada +31 (1533 S-ATK) and a Dark 60 Lightning Espada +31 (1533 S-ATK) on a Level 80 HEro with no Units/MAG and zero SP used on the Skill Tree. I repeatedly used the first strike of a normal combo on a Level 75 Oro-ogar's leg (XH). Here are the results below for the first 20 strikes (I went to 100+ but the ratio doesn't change) :
Spoiler!
So, the damage boost seems to be around 942 / 705 = 1.336 (33%) but this takes elemental weakness boost in consideration too. AFAIK, matching weaknesses basically gives a x1.20 damage boost. So, we could imagine the damage boost of the Lightning Espada's Potential to be around 11% at Level 3 (1.336 / 1.20 = 1.113). Once again, keep in mind that's an estimation which has to be taken with a pinch of salt (I do what I can but I'm not a specialist) !
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