I'd appreciate just a quick check if everything I've done is on track.
It all sound fine to me. You have actually done several things more than the average user.
Is that right considering I've enabled the command fsutil behavior set disablelastaccess 0?
Yes. There is a little bit of confusing boolean negatives there, but setting "disablelastaccess" to zero will enable the recording of the last access times, so that JkDefrag can use them for the SpaceHogs. Please note that it will take some time for the situation to settle down, the last access times were not recorded before so they are old.