I don't think it's a soil/water problem. My first thought...given the move...was spider mites. Upon closer inspection, you do have a bug infestation...though possibly aphids? Hard to tell from the pictures.
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I think I can see some on the "healthy" leaves in some of your photos as well...but really hard to be certain.
As an FYI: a pane of glass can cut photon levels in half. I've measured this with a decent lux meter. Full sun with glass open: 100K lux...typical for full sun in my area. Cloe the glass and 60K lux with the meter in the exact same spot. Some glass cuts more...some less.
Also, outside, shade is significantly brighter than inside. Outside, light reflects everywhere. Inside, it only reflect through the portal of the window. So you are getting significantly less light than you might think. I grow trees in windows all the time...if you think about what you're doing...it can be done...but NOT for all species
Not without supplemental lighting anyway.