Just stop tweaking, leave the FI drop rate.
I dont see problem here. If u need to enter in caves and spend 20 fsp to get one EW potion, than the price of potion will be 20 or more. People who hunt with this potion will still use it or will use lower. Economy will be stable. It should be rare potion and it should be expensive.
also not quite true in reference to the economy. Using lower level potion makes the price of that item go up and the fact that a scavenging drop rate reduction leads to fewer people doing scavenging leads to higher marketplace prices.
It may not be a huge problem - people will handle it one way or the other for sure - but it definitely does not keep a stable economy
It's not fewer people doing the scavenging that will bring prices up, just the reduced droprate. And won't stop the economy going stable again, once everything has settled down.
Increasing the droprate to somewhat under the rates as they used to be isn't going to hurt the whole community that much.
Both things are tied together - lower drop rate in caves means fewer scavengers which in turn means fewer people buying gold in the MP which of course each fsp cost more gold. Without any scavenging and with reduced drop rates across the game, the MP price will simply grow.
Oh and if you misinterpreted my position on this, I think the rate should be at least moved back toward where it was, if not outright restored

