It has more to do with Ostheer being strong enough early game to delay even more the pak or not needing the 222.
Someone mentioned high risk high reward unit, I don't see any high level risk to call it asap and upgrade it with flamer.
90 munitions means you're not fielding a Panzershreck squad, and the Pak isn't the best as a light vehicle counter. The AI power of the Flame HT comes at the cost of AT power.
It sounds to me like Panzer Tactician is more the problem. Crank it up to 5 CPs and it'll still do its job without making 222s and Flamer HTs too powerful early on.