I think the best way to rebalance the gold production is knight multiplier* achievement multiplier, instead of plus way. when having millions of knights, the achievement is meaningless,but still difficult. although multiple way may cause the knights effect *5.5, it still need about 3~4 million knights to expend the gold production at the same level with all map conquest.
 "Your Chronicle"){kind=icon}
 "Reactor Incremental"){kind=icon}
 "Idle Conquest"){kind=icon}