I've been testing Vurt's Leafy Trees amongst others within MGEand there seems to be a problem I'm having with how some of the trees appear.

The trees are lush when you are far away, but then when you come closer around 20 meters or so, something "switches" and a lot of the sidetwigs and leaves disappear and you have nothing more left than a rather skinny leafy tree.

I tried using MGE's zoom function to zoom in from a far distance and see what happens. As soon as I get close in normal view then the "lush tree" switches to "thin leafy tree". You clearly see the amount of air between the twigs. There is NO bloom-spill that's causing this, that's not the issue. Tthere is a trigger.
However, if I then zoom in with MGE while standing still on that same spot and zoom in enough the whole tree appears lush again.

So then I tested in another way by changing the mipmap LODBias to negative values. I immediatly started seeing twigs and leaves popping back as they should be displayed, -1,-2,-3 and then -4 it was totally lush again and look the same "lushness". as when viewing it from a far distance. (I'm sure it sounds strange what I'm saying that the closer the distance the less detailed the tree appeared, but this is true). It's great the negative LOD setting fixes the problem.... However it makes the rest of the world look terrible with a big amount of pixelation and aliasing! Especially the ground and roads.

I tried to counteract this with max AA and AF but that didn't help.

Has anyone had this problem before or does anyone know how to be able to use that negative LOD bias so I can get lush trees without having the rest of the scereny look so pixelated? Is there perhaps a problem in Morrowind original LOD not MGEs?