8x disk limited to 2.4x burn?

I have a spindle of CMC MAG E01 disks – HP branded – and though they burn passably with the stock strategy, I wanted to try swapping to another strategy. Therefore, I used Omnipatcher to switch the strategy to Prodisc R01. The Omnipatcher settings for that strategy should allow up to 8x burns.

Now, when I try to burn one of these disks with Nero, there is only one available burn speed choice: 2.4x.

Any ideas why this happened?

I think you should have swapped to ProdiscR03. R01 is 2.4x, R02 is 4x, R03 is 8x and R04 is 16x.