MS Project - Timephased Data

I need a way to pull timephased data from the MS Project 2002 database - ACCURATELY. I need task level data, so the MSP_CUBE_ASSN_FACT table is not detailed enough. I've tried to use the MSP_TIMEPHASED_DATA table, but this fails to provide accurate data when the contour of an assignment is not FLAT. I need to be able to break out hours and costs by year (by month would be even better).