You do not do 90 day reports on a Non-O entry stamp as that only gives you 90 days in Thailand then you either leave or extend. You get a TM30 on any entry stamp but will only be needed if you are going to use Immigration services for anything such as an extension.
If you have already maxed out one Visa Exempt entry then the safest way to get another Visa Exempt stamp so soon will be to use a border bounce agency.