I just knocked up a rough copy of your game quickly in the simulator. If I played your strategy against a similar strategy just buying some warehouses after the second silver, the win rate is something like 25%:67%. The warehouse brings your good cards into play sooner and discards your green cards on the tactician turns for something useful. As for the other options :
A shanty town could be used for +2 cards since you had no terminal actions.
An inn could return a tactician to the top of the deck.
The forge could close the game out, even if you just forge a colony for a colony.
The vault can be played for +2 cards, discarding the green card for an odd coin and helping the banks too. Good for tactician turns.
Take platinum instead of the 3rd or 4th banks. They're only going to be worth less on very rare tactician turns.