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Civilstorm model does not converge due to surcharged chamber

I am currently attempting to model a problematic system in Civilstorm. The system consists of a typical pipe and catch basin system that discharges into an underground vault. A picture of the layout is below. I have the vault set up as an underground storage chamber system and I am using the Sewergems Dyanamic Wave Solver. 

For smaller storm events the model runs well and seems to give valid results. However, for larger storm events where the vault becomes completely full, the model does not run and I get the following error message. "The model did not converge and no valid results are obtained, check the data or adjust calculation options." I am fairly certain it is the chamber becoming full that is causing the error, because if I increase the capacity of the chamber the model will run for the larger storms.

Unfortunately, this is an existing system and I can not enlarge the chamber. It is also very important that we see the results upstream of the pond when the pond is full. What should I do to get results when the chamber is full? Should I change solvers? Should I model the vault as something else?

Thanks,

George