I found the answer to my questions by searching the forum (imagine that) in a thread I had skipped due to how it started. Slap!
from Wild Brews no less:
9. Vorlauf to remove husks and chunks.
10. Sparge with 190° F (88° C) water until gravity is less than 2 °P (1.008).
OK I can see how messing with/stirring the mash that much will cause chunks to get under my false bottom.
and yes, of course it's fly sparged.
Thank you for your time, there is nothing to see here, move along, move along...