I admit not knowing much scientifically but agree with the out-of-phase and face-to-face method, having used it a time or two.
I will say that the Scansonic MB 2.5s I bought years ago most surely did need a good mechanical break-in of the drivers and it was not an hour or two, more like many hundreds before sounding their best. Other Raidho and Scansonic owners have reported the same.
I am with @ghdprentice in that this can be an enjoyable learning experience for you. Have fun with those new loudspeakers!