Overhand Chop Question?

[Viladin]

Overhand Chop (Ex): At 3rd level, when a fighter makes a single attack (with the attack action or a charge) with his chosen weapon, he adds double his Strength bonus on damage rolls.

When this is used does the 1.5 bonus from two handed weapon apply? If so how is it applied after new bonus (base STR +5 beomes +10 then becomeing +15 for two handed weapon) or do you just double the bonus on the weapon current (Base STR +5 +7 on two-handed weapon changest to +14 with overhand chop)?

+14 would be the correct answer.