This has been brought up by other people, and it is the fact that cradle has no gravity changes. By the time someone is at d29, or "The Core" the gravity is exactly the same as in Haven. This leads to my main point, that d29 is NOT the core of cradle, but perhaps the combined cores of other planets that were sucked into cradle. Looking out from haven (The arcade) you can see spires, with cogs inside of them. Inside these cogs are the levels of the clockworks, and they shift as our clockworks do. At the bottom of each pillar though, is a room with a "core" inside of it, but not being the actual core of cradle. This would explain the gravity problems, as 29 floors of a building going straight down would not affect the gravity.
Can't wait to see what comments this brings up.
Lagging affects gravity.XD