I still think that the economy is not "broken" - it just needs time to settle down in a new equilibrium. What we observe (allegedly) is that there is increased supply of T3 with respect to T2/T1 - comparing to our previous equilibrium. What we expect to see in this case is that prices for T3 should go down with respect to T2/T1. As the prices go down, we would expect supply of T3 to decrease (remove/don't build extra T3 factories), and supply of T2/T1 to increase (build more T1/T2). These 2 processes converge until we get a new price.
Think about it - if current T2/T3 price would indeed be 1:1, why would you build or even keep T3s? Just build T2s, these are cheaper to build and operate, and trade them up to T3.
Now, the prices are sticky so it will take some time for people to realize that 4:1 price is no longer accepted by the market. All this is perfectly normal. The only thing that distorts the market is the star recommendations from the Trader, these are simply misleading as Trader is not standing by to buy or sell at 4:1 prices. But even this cannot persist for long - it doesn't matter what anyone's recommendation on the price is, in the end it is supply and demand that sets the prices. And if you're unable to move the goods at 4:1, you need to adjust prices.
By the way, this is not specific to cross-tier. There is no reason that all goods within the same tier will be perfectly balanced at all times. As such, there is no universal law that stipulates that, say, crystal:scrolls need to trade at 1:1.
TL;DR - I think the economy works out just fine - we may simply get T2/T3 prices significantly different from 4:1. Which is fine by me.
P.S. Some historical perspective: look at aluminum:gold prices back in the 19th century. Aluminum used to trade at 1:2 to gold (yes, it was twice as expensive). Within about 40 years with the advent of the new smelting process, aluminum became extremely common - as it is still to this day. The solution was not to nerf aluminum production
But the outcome meant that aluminum:gold prices became more like 600:1 (so aluminum became cheaper by more that 1000x). Today, it is more like 20,000:1. And we're all cool with that.