I guess this won't help much, but ... I'd suggest you to rewrite those reports in Report Builder 6i instead of converting them.
Yes, I know - why bother and waste time if you can convert those reports? Because you'll probably convert simple reports (which would take no time to write them anyway). Complex reports will look like garbage and you'll spend much more time to fix them than you'd need to rewrite them.
Anyhow, I'd really like to hear whether the conversion succeeded or not.