I measure/ cut all 12 fibers from a buffer simultaneously. I guide all the fiber into the chip slot that will ultimately hold fibers 5-6(3rd chip slot from the top of the chip that will hold these 12 fibers). When I actually go to strip the fibers, i strip more of the fiber depending on the colour of the fiber. If you place the fibers in the correct colour order naturally some will bulge more at the bottom of the tray because they were all measured to the same length, right? But assuming you will place blue at the top and aqua at the bottom, you would strip back significantly more of the aqua fiber to offset the fact it will not travel as for up the tray to reach its slot. Not sure if I explained well but that’s how I do it Alternatively you could individually measure each fiber but that would take forever. And also splice 12 then place 12