@VerdantGreen Hey it’s you from ICmag! I’ve been reading your posts for a loooong time.
@SonsOfAvery , I really don’t see that much to be concerned about. When you water, do a runoff pH test to see what the actual water in the root zone looks like compared to input. This will give you an idea of what the substrate is doing pH-wise. If you are having issues, they look almost negligible. If the plant is growing well and quickly, a little mottling here and there can fall under “it’s just that particular plant”.
A good rule of thumb is:
Dark green “crispy” foliage with small “burn holes” in the older leaves is indicative of high pH issues.
Chartreuse-yellow newer foliage accompanied by purple stems and petioles is indicative of low pH issues.