Some operators ask their pilots to fly at lower Np, prop RPM, which reduces the noise one would hear. XL and Cresco 750 shouldn't sound different at the same settings, the 4 blade prop isn't certified here yet, i think???
I've had the cresco stall on me because of too many fellas down the back. Fortunately I was at FL160, happened to a mate in another walter, and there's that one of the XL on youtube. It's a given that these are all on jump run where the jumpers have to be at the back, where the door is, but at low airspeeds it only takes a small amount of excess weight too aft for things to tip slightly, then get worse slowly yet increasing exponentially..
I hope this spurs on a few of the 'dodgy' operators to get their act together. I believe a few of them are virtually self regulated with rules, as in they make the rules?
Terrible none the less. RIP and condolences to the families and friends.