Adjustment of the idle stop is hardly a fault of the engine or engine manufacturer !
Yea, hafta agree. It seems your engines were idling to slow.
Nothing like judgement by your peers
The two J160's I have time in both have a peculiarity. If the idle is set correctly and a ham fisted pilot heaves the throttle shut the engine stops. If the idle speed is set high so the engine can't stop with a hard yank on the throttle then excessive braking is required or you need to instruct to pull the throttle very hard and keep the pressure on. There is a flex in the system somewhere that I have NEVER encountered in any GA aircraft. Gifted engineers have looked at these two aircraft, the best they come up with (failing modification) is a compromise, high idle or an engine that can be stopped by hauling hard on the throttle.
I know the problem Zanthrus, I have seen it, having a prop stop on final or on the runway is not really my cup of tea.
That said, both aircraft have had no engine problems, both have 2200 hours and both have had engines replaced (in lieu of a top overhaul) every 1000 hours.