Would I be nuts to try Y on a LHR-LAX flight?
Option of the A380 a couple of hours later (I'll fly this on the way back probably).

Working my way through the 787 cabins and have done F and CW so far.
Can pick the exit rows or the pairs of seats right at the back.

Might get lucky with an upgrade offer though as still WT+ to try (and save Y for something short like BOS-LHR or whatever).

If I do end up in Y, would going for an aisle seat be a good option as at least there will be space to lean into even if people keep bumping me?