Ok so apparently for the effect weights 6903 is the weight for the sub weapon, and 7903 is weight for main weapon.
(In the main hand dat of the first shiny you sent me) If you check in the sinr and sotr schedules you'll see that they are calling the schedules
!w01 and !w02, these are the turn on and turn offs. Scroll down further past the first end will take you into the effects section where you'll find the !w01 and !w02 schedules.
If you were to put these effects on different weapons you would need to copy pasta the sinr and sotr schedules and then the lower part of the dat after the first end.. Or just use VRS like you have been xD
As for editing length and position you'll have to experiment with that as I never really had a solid ground as to how to do that. It seemed almost random or at least different for every dat.
http://magicmortar.blogspot.com/2009...g-scaling.html
That would be the most helpful I could be without a computer capable of running ffxi. I can tell you you'll be editing the sections that start with tb01 and el01.
Although looking in those sections I can see multiple subschedules within which I have never seen before. I assume that will be the key to it repeating activation even after equipment change.
I can attest that looking through these and seeing just how similar it is to my method and naming is creepy.