10k units is really really high, right? I think I'll do that, because the method I was trying is giving me a headache. Thanks.
Yeah 10k units is very high because sea level is about 4000. However, the heightmap units are different than ingame units for some reason, so 4k heightmap == 0 in world, and about 7800 is about 8000-9000 units ingame. Not sure why it's off, but alrighty.

Also, it's very difficulty to make 'natural' looking land, so everything you make will be very soft. I'm working on trying to make all my mountains more jagged and abrupt with random ridges and stuff but it's difficult in this. I have a feeling that's why Bethesda stopped using it.