I'm probably not going to be much assistance in the "clumsy" department, but it does seem like everyday BP behavior to me. After all, they're not made to climb.

The thing about this post that sticks out to me though is how small your 1 year old seems to be. Maybe yours is just a slow grower, but my three "oldest" girls are all much younger than a year and are comfortably over the 200g mark.

Their hatch dates and last empty weight:
  • 12/27/2012 - 297g
  • 01/22/2013 - 277g
  • 03/04/2013 - 208g

What does your feeding schedule look like for him and what/how much is he eating each feeding? What about your husbandry? Temps, humidity, hides, cage setup, etc...

Just trying to help!