Trying to uninstall Pro Sites to do a reinstall

Sorry to have to select WPMU Dev Dashboard - Pro Sites is the problem but it wasn't in the drop down and I couldn't go on without selecting something.

I have a multisite install with the latest WP and all WPMU plugins are up to date. http://negotiari.com.

I have installed Pro Sites but it does not appear to be functioning correctly - in particular, the automatic free option is not working.

So I tried to remove it from the plugins and re-added (it still remembered all of my settings.)

Next I removed from plugins and deleted the 3 tables that had pro-site in the name in MySQL.

I cleared cache.

Still it remembers the settings.

What am I missing on the uninstall process to basically get a "do over" on Pro Sites?

Thanks much
Angela