For folks who wish to run at the higher power ranges, a lower resistance build is mandatory. Let's assume the max output voltage of the Sig 150 is 8V (I'm not sure what it actually is, but it's likely in that neighborhood), your 1.5ohm build is going to max out at ~42W before hitting the board's output voltage limit. To take advantage of the power potential, a sub-ohm build is required.
Not directed at you freeall, but, since this seems to come up a lot, atomizer resistance has nothing to do with battery current drain (amp draw) in a regulated VW mod. Given the same battery voltage and power setting, a .5ohm build won't pull any more current from the batteries than a 1.0ohm build. There is nothing inherently unsafe about running very low sub-ohm builds on these devices. As long as you are using coil resistances within the boards operating parameters, it's all good. The whole "OMG, sub-ohm DANGERZ!" thing is a carry over from mech mods and simply doesn't apply to regulated VW mods.
A lot of people are stuck in the 'low resistance = high battery amp draw' thing from the high power mech mod era and I think that is not going to go away anytime soon.
Thanks for posting that. It's nice to see that others 'get it'. I feel like a broken record sometimes lately