Never mind, I realized myself that I mixed the price set in goods.ini and shiparch.ini. The thing is, FLStat and FLComp uses the cost set in Shiparch.ini, while the game uses Goods.ini to set the actual price of the ship. The only thing that makes me wonder is why, cause goods.ini is linked to the ship "model" and shiparch entry just as much.
Never the less, it's still not a valid point for not having packages , that a third party program doesn't use the right file to access prices.