Badge evidence question

I'm planning my Silver distance flight. After reading the Sporting Code and
several guides, I still have a question.

I'll be using a Volkslogger, and I'll be winch launching. My planned Finish
Point is lower than my Start Point, so I have to very be careful about the
1% rule. The guides talk about notching a barogram to make the release point
clear (when aerotowing). Is that necessary with a flight recorder and a
winch launch? I really don't want to lose 200' to create a notch, if I'm
releasing fairly low off a winch launch. Would a tight turn or circle right
after release from the winch be evidence of the Start Point, rather than a
loss of altitude? Or is it even necessary, since the cessation of climb
(from 45 degrees up, to level flight) should be pretty obvious?