I ordered some replacement coils for my Mini X9 last night, online. I ordered the 1.8 ohm version, but I noticed on a Chinese web site selling the Mini X9 that theirs comes with two 2.5ohm coils. I have no idea what mine has in it; the specs don't say. So, what difference would I notice between the 1.8 and the 2.5 coils, using the 650mah ~3.7v (max 4.1v) battery that came with it, or my spare 1000mah e-goT (constant 3.3v, I think) battery? Did I make a mistake?