I want to say that I got around 710 with DSTM. I pretty much try them all as they release new versions. I end up sticking with Excavator due to better hash and no fees. I also get better hash with lyra2rev2. I run 3 workers with it.
Do you mean for your GPU, the excavator is faster than DSTM? How about the power consumption?
When using same tdp and clocks, excavator will out performs. When comparing 2 different miners, I always use the same settings. I change up settings depending on different variables. I will go for max hash some days, others I go for max hash per watt.