4th job Single Target DPS

To the best of my knowledge, dual charging:

Lightning (125%) + other charge base percents (110 to 150%) are multiplied.

Elemental advantage is cut to 25%, and only 1 advantage applies even if the monster is Lightning+x weak.

So the best neutral combination is 125%(lightning)*150%(holy), which also does higher dps than Lightning+Ice on Ice-weak stuff.