HD Practce Day Two

I started day with my instruments work then I wasn't able to find battery bracket so we had to remove seat pan to check it, but no luck then I found that bracket is installed but slides in to hidden compartment and no way to see it.
I launched as one of the last pilots and started at 2Pm for 522km task
I had good run to first TP but then speed went down due to very strong head wind.
On third and forth leg I flew over 100km without turn and ended up just 300m AGL as no trace of cloud .
I found 2m/s lift and went for final glide from 69km . 35 km from finish line I had 300m reserve which went to 0 at the edge of the field due to heavy sink and head wind.
Tomorrow I plan to work on my instruments and fly the task task.
Jerzy