"best way to get Upgrades is going on adventures". The adventures in factions is not very adventurous. For a maxed player you play through them very quickly. For a new player you play quickly until you have to stop to develop your regiments to be able to win. So then a lot of waiting, then win some, wait, win, wait and you are at the same place as maxed players. And then the only thing left to do forever and ever, is FARM.
Not much of an adventure, is it? Maximize profits, that is ok by me. But doing it in this "get rich quick" scheme will scare away a lot of players.
Maxed players are sick of pvp being a diamond bidding war, bored with doing 3+5+10 ship fights (we do it to help our not yet maxed members), bored with no new content, and super bored by farming factions - but you still do it to get stuff, in case of new content.
I am sure new and medium players are having some fun doing factions, pvp and clearing map. But when they reach the bottleneck of many shards but no upgrades and no gold they will leave. Innogames are hoping they will start to pay to advance - my guess is unfortunately that most of them will instead leave the game. Ultimately killing the game.
Please do something more about this, than just fine tuning drop rates. And for the love of God, release some new content (6* regiments, Campa map area, a new regiment etcetera) sooooooooooon.