I'd reckon left of the tarn for Anniv Waltz, right of the tarn for Borrowdale.
I did do a bit more mucking about with alwaysinjured's route, and tried something along the lines (in bugger-all visibility) of, from Dale Head cairn
400m at 150 degrees
200m at 90 degrees
50 degrees to the tarn
and yes, it was reasonably runnable.
I'd still favour the stright down route for the AW, but when I have trashed quads at Borrowdale I think this might be worth a think.