ok, scaling works too now. I go sleep, will clean and upload tomorrow. BTW. I tried the 128*128 size, but the result was completely messed up. I think this happens because the model is temporarily too large (right after optimation it's unwelden, using unshared vertices). Then after welding the number of vertives is legal again, and it renders without a MAV, but some Vertices (about the half of the ones that are part of the surface that was too big) are misplaced, at the bottom of the mesh, seems like they became Zero Coords.
However, 100*100 works, since 100*100*2*3=60'000, that is below 64k.
However, 100*100 works, since 100*100*2*3=60'000, that is below 64k.