It is best (in my experience) to apply JBroid script right before you apply Franco's kernel.
I did this when migrating from CriskeloV6+FrancoV6 to Darky3.3+FrancoV6 two days ago and I did not need to wipe data, only cache.
I unplugged the Note this morning (7:30), and now (9:38) the phone still displays 100% battery . With some reasonable use including more than 2h surf, some calls and texting, I usually have more than 20h battery time.
[Edit] JBroid cleaning script page