Anyone recommend a diesel tuner in Adelaide/SA?

I used MTQ for a few things but they're a bit.. Big. No specific issue with them by any means. Just looking for someone that knows what they're doing that you can actually have a chat too about what you want - and what they can do.

I'm sure MTQ are still a good specialist but you talk to a receptionist when you walk in and it was a bit of a hassle for them to talk to the mechanic.

Anyone know of a reputable place in Adelaide or SA that knows what they're doing with old diesels?