Matrix Table and formatting subtotals and values

I'm providing my team with sector, sales name and account level data in a Matrix Table and currently I do not want them to see the values so I added conditional formatting to show value font color as white. The problem I have is when I collapse to the various levels - that conditional formatting is applied to the subtotal / total rows which now become the value rows. How can I fix this so the subtotals are always showing? 

Current view: 

What I'd like to happen: 

Thanks!