Upgraded to TRM 0.8.0, then discovered I had to upgrade my AMD driver from 20.4.2, too, in order to get the new config mode B work with my RX5700s.
Then discovered I had to upgrade Overdriventool from 0.2.8 to 0.2.9, since the old version didn't work with the newer driver.  
I tried AMD driver version 20.9.1, since that was the lowest recommended, but found this to be flaky.  And overdriventool would not apply settings.  In the end I reverted back to AMD driver 20.4.2 and am now running the miner with A576 config on all my RX5700s.