I did it similar to how it sounds you did - shuffled hands along a bit from the byker groove holds at the highish break level (maybe just rh out r, then lh into where rh was?), then rh out r to lowish slotty hold, lh over to crimp/pinch, rh bumps twice to go round the arete like you said. Feet on rail (or on higher foot on lh wall of groove) the whole way, then finish as for PIB