Ok, after working with these for a while, I think I found exactly what I want out of them. As much as I want them to be lighter these will work much better at 15 tons. It could be the explanation for the fuel cell engine... but yeah I'm going to fluff the main gun as something interchangeable, where it is often swapped for a medium chemical laser with 15 shots, rocket launcher 20 or some kind of electronics suite (the electronics will actually be the most common one).
Clan Burrock Underground Battle Pod Series
"MicrOst" Type A and B ProtoMechs
Mass: 15 tons
Internal Structure: 1500 kg
Engine (135 Fuel Cell): 5500 kg
Walk: 6
Run: 9
Jump Jets: 0 kg
Cockpit: 750 kg
Armor: 2650 kg
H: 7 350
T: 20 1000
A: 3 300
L: 15 750
MG: 5 250
Weapons: 4600 kg
Battle Pod Type A "Nightcrawler"
1 Watchdog CEWS 1500 kg MG
1 Medium Chemical Laser (15) 1500 kg T
2 AP Gauss Rifles (12) 1600 kg T
TOTAL 4600 kg
Battle Pod Type B "Deathstalker"
1 Watchdog CEWS 1500 kg MG
2 AP Gauss Rifles (12) 1600 kg T
1 Light TAG 500 kg T
1 Rocket Launcher 10 (PP) 500 kg RA
1 Rocket Launcher 10 (PP) 500 kg LA
TOTAL 4600 kg