Hearings are underway right now about revamping the CTTT (and other tribunals) HERE and into bringing strata law up to speed HERE. Chip in with your suggestions while you have the chance.
Meanwhile, your EC should be sending a polite notice out to all residents telling them that you have issued an Notice To Comply to one resident about parking on Common Property and others will follow if abuses continue. If the NTC is ignored it could lead to heavy fines and these notices apply to tenants as well as owners. That should save you the hassle of having to have a meeting every time another opportunist rogue parker notices that the space is suddenly free.