[Plane]

Since the largest human eye's largest dimension is under 1.5 inches (SM-10) and "elongated box SM+1" gets it to the -9, are you saying that eyes are more like "blob-shaped SM+2" (base -8) and the -1 that brings it to a -9 final is due to speed/range?

Not taking distance into account (distance in yards is added to yards/second on the table) to get a -1 penalty for Speed alone is 2<x<3 with x being yards per second. For someone who doesn't leave their own hex, although the final relative movement is capped at 1yd, the sum of movement vectors back and forth throughout that second could exceed that.

If rules assume that people are doing a variety of things to incur the -1, then a +1 to hit those who are totalling less than 2y/s worth of sum movements.

Or, if you take the basic hit locations to assume an unmoving target, maybe use the distance penalties even for melee combat and for attacks on the head, supplement distance by Basic Speed multiplied by each headbutt, retreat or dodge against head/neck/torso attacks you've done in the last second.

Could do similar for limbs but with attacks/parries in place of headbutts and "dodge against attacks on that limb" in place of dodge against head/neck/torso.