cowanrg

That's way to tight for a bearing like this ( - .0025 ) you only want around ( - .0002 ) the preload is a big problem on these spindles, they are a very poor design, you really need a set of spacers, between the bearing, then you adjust the spacer length to get the right preload, once set it is good for ever

The top bearings don't need any preload, post a photo of the spindle parts, this will give a better idea of what you need to do, to fix the preload