with 2x12 Kone you should be able to manage situations like that. I don't trus 1x12 Kone anymore
Btw. 2x12 sounds better IMO
2x12 Kone only makes a difference if you use a separate power amp.
The Kemper power amp halves the volume due to impedance.
As a result, to me it sounds no different to 1x12 Kone and I've cranked mine to ear splitting volumes no issue. I suspect the others were faulty.