The only way to see if there is any improvement is to try it out. Rather than changing it around all the time I have found that the best time to make changes is when you’re doing a clean and then try a different racking order. And then just review it each time. The biggest and best changes I have found are keeping the preamp at top of rack, and having separate brain and brawn stacks.
It can also work well having source on top of brawn stack. I had to do this when I had CDS3 being a top loader and having the LP12 shelf on top of brains stack.