Importing with 3DS Max 7 scale issue

My problem is that when i import my model into unity the scale is way off. This not concerning the scale 0.01 to 1. My problem is that when I imported my model from autocad to 3ds, I changed the scale to be smaller in 3ds max and fit the 1.8 meters height. For some reason the model came in to big even tho it was designed in autocad as 1.8m high. Thats another problem tho. So i imported it into 3ds max and changed the scale. Then went on making a biped, conecting everything, and then animating. About 1960 frames on animation and about 48 animations. about 14 hours of work. Then exported as a fbx, and then imported into unity. Then it came in very wierd and i realised that by scaling in 3ds max that it screwed up all the scale setting in the fbx export.
Anyone have any solutions to fix this in 3ds max in setting or in unity? I am using 3ds max 7. Unity 4.3.
I hope I dont have to redo everything but atleast I can load the biped poses to a new file.

So the original size I imported in 3ds max from autocad are the same when i import the fbx file into unity and everything is clustered together.

Are you looking at the model in a scene or in the model import preview window?

Worth noting that re-importing models of a different scale that were in the scene resulted in models that started clustering up. It was like the pivots didnt scale. Deleting and creating the model in the scene again removed the problem.

Cant say if this is still an issue or even related to yours.

whenever i have issues in max relating to scale or anything like that i reset the xform to be safe, this will totally screw up the rig though