Minecraft – What’s the best location for the player to spawn slimes in these 4 chunks

I located an area in my world where there are four adjacent slime chunks. I would like to make a high-efficiency slime farm here.

The bottom-left corner of the bottom-left chunk is -432/32/80 and the top-right corner of the top-right chunk is -368/32/48 .

What is the best location to AFK, in x/y/z coordinates, to maximize slime spawning given MC 1.9 spawning mechanics?

I imagine it's somewhere in the non-slime chunk which abuts the inside corner of the L at -384/*/64, presumably also at level 32 (which is the level where I chose to mine out the farm), i.e. the corner I'm facing in this screenshot:

Also, I noticed that while I was digging out the farm and inhibiting hostile mob spawning with torches, I seemed to get a higher slime spawn rate than I currently am using jack-o-lanterns for the same purpose.

Does using jack-o-lanterns in the floor inhibit spawning on those blocks, and if so, how far apart should I position the lanterns to maximize slimes while completely inhibiting spawning of any other hostile mobs? I would really prefer not to use torches.

Answers which substantiate themselves with reference to game mechanics and walk through the arithmetic are preferred (all helpful answers will be upvoted, but I can only award the tick to an answer which proves itself correct).

_{Note: Any indication of the radius on the surface I need to light up would also be helpful (I already went cave lighting for half a kilometer around my base, so it's really only the surface I need to light up so the farm continues to work at night), as would any suggestions on where to dig the water channels so I don't lose too many spawning spots, though I imagine that might be better asked as a separate question.}