They don't NEED a weapon to scale, but they need some attention to. It could be small things with each tier that improve them, make them cheaper, improve their abilities. Make them attractive and remain unique. The
Their doctrinal abilities are fine where they are.
Their stock abilities, outside of oorah being nerfed hard(doubled the cost) are also ok.
AT nades are fine, molos are just bad, vet2 bonus makes them better, but by that time there are weapon upgrades on field, making the bonus throw speed not that relevant.
To be honest, I can see no other choice but either T3/T4 stock weapon upgrade or a price cut up to 30 mp(10 will do nothing and everyone knows it, it needs to be significant enough to make a difference in field presence).
There is hardly anything unique about the squad, except for the fact that they are "doctrinal stock infantry" and why? Because unless you go specific ppsh doctrine, they are unusable and people tried and tried hard, failed each time.