Howdy HH! Found your mug in newty's thread and thought I'd read through. Plants look terrific and you're getting great advice from the folks who are already here. I'm an outside soil grower so I can't attest to indoor stuff other than what I've picked up here on the site.
Fan leaves have very little THC in them, so making massage oil from them wouldn't be good for pain relief. And, having made fan leaf oil (I think I mentioned this in the Cooking with the Chronic thread), I can tell you it takes a lot of gummies before you feel anything (my wife had to eat 18 bears to get high
). So if you want something that hits you, save up a lot of fans (I used three big ziplocs full!) before you bother making edibles.
What fan leaves
are good for is feeding your endocannabinoid system, so as Dutch said, eating them in smoothies, salads, on pizza, etc. is a great way to get them into your system.
Oh, and I'm with MrSauga on that meter. It's more of a toy than a scientific instrument. I bought one when I started growing but soon after bought a real pH meter and TDS meter. TDS (total dissolved solids) is what most growers are referring to when they say PPM (which is really a different scale).
Nice defoliation...newty would be proud!