So I wanted to give you all an update on the little guy. I've changed his cage layout to a simpler, more natural look and he seems to love it. The tripping and falling that seems to be induced by stress have been reduced dramatically!
Here's a picture of his current setup right after I cleaned it today - included is a munching Puff:
I've also started him on a treatment with vitamin B supplements. He's been on it for 4 days so no results to report on that as of yet. He has also gained 10 grams in 2 weeks and seems to be growing very nicely. His fur is fluffy and shiny and overall he looks very healthy!