If you turn of the dwell override, it doesn't matter what is in the dwell tables. Until 2.05 came out, everyone ran CNP this way. The cars would idle ok off those default tables. Depending on how "bad" the idle is, this would eliminate bad data in the dwell override tables. On the early 2.05 software, I would see issues loading the default dwell.ict tables.
The main thing I'd to help the OP. After lookibg at the dwell override The next thing I would look at, is the cam signal, crank signal, and crank error to make sure we're not dealing with a noise issue