Rtsjr, I've wondered since it arrived how I ever managed without it, and in all honesty I still don't know. I still find it amazing (a month in) that just a few degrees turn of the dial can lead to such a different vaping experience but still, that's what it does.
I've now found a new 'trick'. I use two 901/510 adapters, using one in reverse, so I can DD a 910 on my SD via the booster.
I don't want to say anything in particular about that setup... just try it. Words escape me