I tried to go from TRUE to CCM customs and it wasn't terrible but it definitely took some time to adjust. Most significantly was the fact other skate boots having a neutral pitch or very minimal forward pitch from the factory and TRUE has a very noticeable forward pitch built into the boot and eyelet positions.
As such, I eventually went back to TRUE after a while. While I felt faster with my FT2 customs on the top end, 6+ strides, but had dramatically less control and agility in the first 6 strides. Cannot comment on custom Bauers, I have not got them yet. I did try the Vapor 2X Pro retail skates and absolutely dislike them as they felt sloppy fitting, which is expected coming from custom skates to a retail model. Many others have said they are very nice though.
As for rivets and such, I use a little drop of this on my rivets and such and they never rust or get loose. Plus it easily scrapes off if you need to service the skate/holder.
https://www.homedepot.com/p/Gardner-Bender-Black-Liquid-Electrical-Tape-4-oz-LTB-400/100119178