Power Pro 236 Plasma Cutting Limits

Hi everyone,
Last weekend I finaly tested my Power Pro 236 with Trafimet A81 Plasma Torch. I think I have done everything wrong, but I learnt a lot. Never did plasma cutting before. I tried cutting 12mm mild steel. All right, it was a hard one to start with. After a complete failure I finally decided to read about it and I figured out I probably did all the mistakes I could.
My question is what the max. thickenes on a mild steel can be cut with this machine when all parameters are perfect (current setting, stand off, dry air, drag speed,...).

Thanks,

Luka