I build 5 edges before L2C, so the chances of having an extra premade pair to deal with are quite high, and my back slots are always full.What are your thoughts on co-centre building (building two centres at the same time) and (partial) edge pair preservation during L2Ce ?
I'm asking this because, I find myself doing that on 4x4-6x6 (I use Hoya on all three with a particular combination of 3x3 methods) and sometimes it does pay off in terms of move count (especially when the preserved edges are fully paired) but sometimes (especially when I try to preserve 2+ edge pairs) it feels like a waste of time and effort.
Apologies if it was already discussed on this thread.
If there's one extra pair, I always try preserve it. If I can, I try to put the pair in FR or FL then use inner slice moves where necessary to finish the centres. Other times, if the pair is in U and I can put the pair in UR so that Rw could hide the pair, then I do an F move to position centres so that I can pair them while hiding the pair.
If there are multiple extra pairs to deal with, I will almost always pick the easiest to preserve and forget about the others. The exception is when L2C can be done with <Rw, U2>, in which case I put the pairs on the sides and preserve them.