I followed a tutorial importing landscapes from Gaea to UE and it said to multiply the size of the map in Gaea’s export settings (for me it was 10,000) by UE’s default of 100 and then divide by the resolution of the height map. As for your third point, I was under the impression that better resolution meant more detail so that’s why I exported it at 16k. And now your 4th point, is there then a reason it was freezing and crashing when the components were 2x2?
Also, do you know the settings I should use to make the landscape smooth?