I like this OG Field: Nerve Growth Factor which encompasses the whole nervous system including the brain and gives it all a nice little encouragement. I used it a lot early on when I kept finding myself overwhelmed but refusing to cut the size of my stack.
That said, it sounds like you’re already well equipped!
White Matter’s enhancement of myelination directly increases the ‘insulation’ of your nervous system, which is helpful in terms of protective aspects as well as signal degradation, so it ought to be of ‘more use’ (for this particular problem!) than many of the other brain fields.
It’s like wrapping up the transatlantic cables with thicker coating so sharks can’t chomp through communications between the Eastern and Western hemispheres.