Hi kjg. The wattage of the vape is determined by one main issue. FIRST is the ohm measure of the coil. On the side of the coil it should tell you what the rating is and the "suggested" power setting.
I can't "guess" what the coil reads, or if it is a temp control or power mode coil, to suggest a setting. Your mod should also read the coil to give you an idea of what power to apply. Let us know the specifics and we can be more help.