MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
There are two sizes of hinge, the larger ones (item 7) are for the finger base and the smaller ones (Item 8) are for the finger joints. Which ones are you having trouble with? You could scale the hinges a tad smaller if your flow rate is too high. Have you cut away all the support in the finger's hinge slots? You can reduce the infill percentage to make the hinges more flexible too, depending on what filament you are printing with.
Hope some of these ideas help you.