Plane Landing Short

I’m looking for some guidance for tuning Arduplane automatic landings. We’ve got a heavy Believer plane that seems to always land short before the actual landing point.

The plane is on version 4.3.5 and uses a laser altimeter for landing. The landing approach is set up for a 5-degree slope angle.

The attached log shows the plane was not able to meet demanded speeds for landing and pre-flare landing. The actual speeds are higher than demanded. Even still, the plane looks like it wants to nose down right before the flare. This shows up in the attached log. Does anyone have any ideas for why this might be? Any suggestions would be appreciated. Thank you! 2023-06-20 10-23-43.bin