I like the armor reduction.
Strength in Numbers
8" could chain across the entire map. So the bugs are really spread out rather than a swarm clump.
You could make that 4" or 6" to make the swarm more compact and swarm like. 4" would get that.
Skill could be 1d6-1, and Strength gets +1, so back to 1d6.
So 2+ bugs work as normal, a solo bug is 1d6-1
Ok idea but who is going to field 20+ bugs.
Instead of the entire battle field, count the bugs that are in a Strength Swarm and drop the number, to maybe 5.
So you could have a swarm of 5 bugs in 4",
but more than 4" from a nearby swarm of 5 bugs, no penalty.
If the two groups got too close, the Stupidity kicks in.
That could be a tactic the enemy uses against you, if your swarms are too close, push a bug into the gap to make it 6+ bugs in 1 swarm.
Do the bugs have an attack besides implants?
Do Implants need a normal attack roll? Does armor defend?
With instant death after an attack roll, this just seems like a normal attack with an angry (two)inch move
Well it would need weapon stats if it were a normal attack.
100% attack success with insta kill seems excessive.
Perhaps this just explains how it gets a normal attack without using a held weapon. It has an internal weapon. Stinger.
Just some ideas, to think about.