Some things I noticed

[N. Tollus Galicus]

Hi!

-Pila seem a bit weak in my eyes.

Cinna

The pila are probably weak because you're throwing them at advancing infantry, so that many will bounce off the shields. Doing a bit of flanking might make the pila deadlier, but at the cost of a thinner line and the chance of the whole infantry unit being taken out by cavalry.

Pila aren't indeed supposed to be deadly... They precisely were supposed to hit shields and remain stuck in them thus rendering their use very embarassing. Pilum is is a disorganising weapon, not a lethal one. This is why they are thrown just before the charge.

Tiberius, your method is 250% anti-camillian!!! ;-)
Hastati/Principes formation should be square!!! (and checkboard, but this is a bit harder to achieve with 20 unit limit and half of them being allied bums lol)