1001 U.P. Black Fly Questions

I posted some questions here a few years back before my first trip to
the Yoop and got some helpful advice (a grateful tip of the cap to Mr.
Wolfgang) on streams around the Kenton area. Planning a return trip in
a couple weeks and I'm hoping I can score some insights on a different
topic this time: Black flies. Our last trip was in late summer/early
fall, so these pests weren't really an issue. But with the return trip
scheduled for the first week of July, I'm a little worried this time
around.

First, is it completely nuts to fish up there this time of year?
There's some indication in archived posts on the topic that black fly
season may be over by early July. Can anyone attest to how the season
is shaping up so far this year?

Second, is one repellent better than another for black flies/deer
flies? I'm sure I could get multiple answers here, but any advice based
on experience (or otherwise, I suppose) is appreciated.

Finally, are black flies more of a stream nuisance, or should we expect
to battle them around warmwater lakes as well?

While I'm at it, I'll push my luck with a bonus question as well: Any
Kenton-area streams fish better than others this time of year?

Thanks a bunch for any help.

Justin