Geez Andy, I am glad that everything turned out well...but....
You have been very open with sharing your incidents with the Jabs. Now as far as I can see, there are three possible situations:
1. Systemic failure by whoever conducts your maintenance. I'm sure that you have already looked into that.
2. Systemic failure in training, leading to pilot abuse/misuse of the engine and early failures. I'm sure you have looked at that too.
3. Systemic failure by the engine manufacturer, whether during parts manufacture, assembly, or design fault.
Either way, I would feel confident that you and your business would have looked very carefully into the first two options. I just would like to hope that the manufacturer is looking into their option just as thoroughly. I'm certainly not a Jab basher, and enjoyed my one flight in a Jab 15 years ago. I would love to see them succeed, especially being an Aussie business. But if their engines can't reach TBO in a training environment, then you would have to question why they are certified for training.