Conceptually back-to-front seems to make the most sense, but as the simulations show it's still not efficient. So instead of plainly loading back-to-front, load

Conceptually back-to-front seems to make the most sense, but as the simulations show it's still not efficient. So instead of plainly loading back-to-front, load back-to-front but skip rows. That is, if there are 25 rows on the plane, load rows 25, 20, 15, 10, and 5 at once in that order, and in the second wave load 24, 19, 14, 9, 4, etc. That way, the people sitting in row 25 will have a 4 row buffer between them and the next passengers to wait while they get seated and aren't blocking the next group (in row 20) from being seated. Does that seem reasonable?