Yeah oztrack.
I was going to get a mate to tune it for me so we can learn. Now we either fork out of software to erase it and start blank or I get a new PCM.
Either way it's crap.
So just to be clear the OP was talking about email tunes... so I gather you had an AutoCal on loan to upload the email tune from OzTrack, drove the car for a while, weren't happy despite several .efi file logs you provided as part of the mail order tune process and OzTrack's respective tune file revisions and ECU recalibrations?
Personally I would've sorted it out before I sent the handheld unit back. How long did you run with the tune before you sent the AutoCal back?
It seems reasonable to ask OzTrack a) to revert the tune and delete other files via AutoCal (you will probably need to put a refundable deposit up for device loan), or b) arrange to have the to stock tune reflashed to the car at the Sydney workshop for free, or c) negotiate an arrangement to communicate exactly what the issue is and customise the tune to address it on the dyno.
The tune file is not locked onto the 'PCM', can always be reflashed. The .ctz file provided by the tuner (OzTrack) specific to your ECU is indeed locked. It's like copyright.
If you want to modify your tune yourself then email tunes are not the way to go, and that setup has its own pros and cons including costing a hell of a lot more.
In several dealings with tuners I am required to provide ECU 'reads' - logfiles - to participate in the email tune process - it's very interactive actually, sometimes you have to report about a dozen logfiles back via email before the feedback / communication of (my) layman terms meets detailed engine tuning and what's being reported in the log files.
But yep, it's worth it.