Its more than once i am seen comment like: "They just copied Wargaming tier system, with no idea what they are doing" in the chat during and after the game.
As much as it sounds rude, it feel more and more that its how it is. Where its understandable that you wanted to learn from other games, unfortunately you seem learned the wrong thing. For Wargaming it wasn't really like: "Hey, this power tiers seems like and awesome idea, lets use it!". In World of Warships (in particular) their goal was recreate pseudo-historical battles, with large variety of ship from 19th to 20th century. And where technically they've could balance so that mid 19th century ship could compete with mid 20th century ship, battles like this would look ridiculous. So for them it was more like: "We don't really have a choice but to pick this power-tier system, and try balance it as best as we can".
You however making game about future spaceships. And no one really will come and say: "hey, this ship just can't compete again that ship, its just ridiculous!". So there is literally no need for you to use power-tiers at all!
When you first told about 2.0 progression, you were just mentioned that you want make it easier for players to unlock ships they really what to fly (which is also not working, because of ridiculous 50,000k price for tier-3 ships, but that another topic). And me personally expected to game to be mostly the same, with just linear progression evolved into tier progression. Which is awesome idea btw. But i completely didn't expect that you actually meant higher tier ship been plainly more powerful in EVERYTHING compare to lower tier. I though they would just have more customization options. And i bet i am far not the only one who had such expectations.
I know it was hard enough for you to make this whole new tier system, and i personally don't think you need to waste another half year of development to make some other 3.0 progression system. It just this exactly tier system need heavy tweaking. In particular, as i already mentioned it in another topic - all tiers should be balanced with each other. You don't really need complicating matchmaking so higher tiers should play only with higher tiers. You just need to make that tier-5 ship would be roughly as powerful as its original tier-1 brother. It should have absolutely same main guns. It would have higher variety of secondary guns to chose from (though of course you also should give tier-1 ship fixed secondary guns as well then). Higher variety of modules, none of which would be plainly more powerful than similar on lower tiers. And higher variety of officer briefings (again with ensuring that tier-1 have fixed set of officer briefings).
Yes, higher customization still obviously gives the advantage over those who have less customization options for his ship. But if you think about it its not so bad. yes, in single taken match person with tier-5 ship can excel again team with mostly tier-1 and tier-2. But that's actually means that he also get a very nice score. High K/D ratio, lots of damage done, good support provided for the team and so on. And providing that you MatchMaking Rating system actually works and he gets much higher MMR, in the next match he will be put against stronger players. Eventually that person might encounter situation where he in his tier-5 ship can't beat team of tier-1 ships, just because they are actually better than him, and can excel even with 'fixed' ships they have at tier-1.
So that's that. The only really bad thing in original system was linear progression. Balancing wasn't really bad at all. And nothing wrong now that you have so many more ships - nevertheless balance them all together, as single power tier. Counting higher tiers only for higher customization.
P.S. Actually to think of it, higher tier ship might have bit different primary weapons, but not as plain upgrade again. Just different stats on same type of gun. Something better, something worse compare to original tier-1 gun.