Two variant ideas (with the disclaimer that while I love the idea of them, I am bad at protomechs, both in using and in building.)
1) Drop the armor by a point and put in an AP Gauss and a Micro Pulse Laser. Shoot all the Infantry. Win.
2) Put in a Heavy Small Laser. The range is shite, but you can either put in something like SRM 1 with 5 shots (reducing the armor by two points) to go with it OR put the rest of the points into armor, with full points on the head, arms, and legs and 13/16 on the torso. It'd still be as maneuverable, would take more of a pounding, and when it got close could do a decent amount of damage for something that small.
