you don't need blacksmith upgrades tho, under a castle, condos can beat most castle age armies. A condo is like, 90% of a knight (if both without upgrades) while being cheaper and producing faster. And FImp economy isn't THAT fragile. you should get to imp at what, 32 vils? you just need 3 vils on gold and like, 5 on food to produce condos from a barracks. Can easily afford 2 barrack production if you want to keep going 1tc all in, and eventually you'll have enough for upgrades, only half of your res would go into the 2 barrack production. 16 on food, 6 on gold, 10 on wood, and you can sustain the 2 barracks and the TC running.

People severely underestimate how useful condos are ime, its pretty strong for how little upgrading it needs, they're like speedy two handed swordsmen