Keep your indoor and outdoor FTPs separate. You’ve got different power meters as well as different amounts of cooling. Ignore that stages PM when you’re indoors.
Just make sure that you are calculating the TSS with the proper FTP for each workout.
If you do happen to contact either of the manufacturers and find out one of them is faulty, please pass along the info. I know 5 people that bought Elite Diretos and they have all been replaced at least once under warrantee. (2 of them twice) I was hoping that the Suito would be better. We are looking at changing from Saris to Elite at the shop I work at because everyone is buying Elite at another shop across town due to the price difference, but we’re wary due to the reputation of the Direto.