[Elecraft] KPA100 recommended max power for digital modes?

[WA7SPY]

I just ordered a KPA100 with the auto tuner for my KX3. In anticipation of the arrival of the amp  I was looking at the operating manual online and did not see any recommended power setting for operating the amp with digital modes. I plan to use the amp for PSK31. What is the recommended max power setting for the amp using PSK31 with a KX3?

Thanks,
Glenn Maclean WA7SPY