From what I can tell, the 70W version appears 'overpowered' as it under-reads resistance... my BB coils read about 0.45 on the mod that I build them on, but read 0.38 in the BB. Which is why they run hotter.
@Darth Vaper are you sure it is not your mod that gives you a wrong reading, reason I ask is I tested my Exocet and Insider on two different mods and compared with two different 70w BB's and a BB DNA40 and I get the same reading on all, at most 0.01 variance