I suggest adding the option for a target UI element that can be enabled in the assistance menu. Maybe something like a dot that moves in a circle and the dot represents the sling load over the target area. Add to that a bar with a height indicator to see how close your are to 30 ft.
Unfortunately it is really hard to hover a helicopter in sim. There is just a lack of physical feedback and the inability to assess distances. Besides VR there is also the problem of looking around freely. I can use quick views but then I constantly have to switch around which causes the loss of any reference point for hovering stable. And from cockpit view it is just impossible to see where the load is because the mirrors on the H125 also don’t work. Some of that is just the reality of a sim, not much can be done here in my opinion (besides the mirrors).
Because of that we need other assists like described at the top. In real life you also have ground personal that give you feedback via radio. Maybe that could be implemented? Right now it is a frustrating experience to do SAR hoist missions or sling loading because you just have no idea where you are and it’s already hard enough to keep the helicopter in a stable hover