Also, the flop is well and truly back. Saw the Tits penalised for a regulation flop and wondered if Melbourne/Roosters/Bunnies would have been penalised for the same thing, I very much doubt it.
The wrestle is a harder problem but I reckon there are still good indicators (not KPIs). I remember growing up, we all knew when a tackle was complete whether you were tackling or being tackled. Modern players have lost that knowledge (or conveniently forgotten it) and wait until the ref tells them to get off. They then get another second or two to get off. Way too long. As soon as the tackle is complete, require them to get off the player without waiting for the ref's instruction. A ref's call of "Held" should be enough, if they can't take the hint, ping them until they do.
Got interrupted, here's the rest.
The indicators I see all the time are:
1. Players adjusting their grip (usually to around the ball in a wrestling move). As soon as you see a second movement after the tackle is complete, penalty.
2. Players looking at and speaking to the ref while lying on the tackled player. Penalty.