Hmm, testing with a single Vega56. Was getting ~2035 with 1.6.7, now getting ~1630 with 1.6.8. Tried both the Normal and Maxi versions, same results. Using the 18.6.1 drivers, so not sure what to make of this

Ok, figured out my issue. I had intensity: 0 in the config, and specified a GPU-specific intensity (112). Once I removed the gpu_conf section, it worked perfectly. Don't know if this is a bug or a change in how inheritance works in the config files.
when you set intensity to 0, miner sets worksize, number of threads and intensity automatically