My tiers of commanders in Command deck

After playing some games with the command deck I feel the commanders are quite imbalanced.

Tier 1 So far I get the most wins with Overlord Newburg (green-blue), no matter starting first or second. It's actually hard to lose with him against other commanders. His standing gambit hits the perfect combo of offence and defence.

Tier 2 The next best are High Director Valken (blue-red) and Hive Admiral McCready (green-yellow). Valken has good scrap and defense and can convert excessive scrap ability to 5 authority gain per turn. McCready is full on rush, can be unstoppable to most other commanders as he can easily hit 10+ damage consistently from early on.

Tier 3 Biolord Walsh (red-green) stands on the third tier. The base shield buff-debuff gambit is quite dependent on the trade row.

Tier 4 Fleet Director Nandi (yellow-blue) seemingly has the most valuable gambits, but her problem is too slow, with the smallest 5-card-hand. When most of the other commanders are fit to rush from the beginning, her specialization in money just can't catch up, unless you can get some expensive cards very early on. Trade row is the decisive factor.

Tier 5 Divine Admiral Le (yellow-red) is my least favorite. The gambit is hard to trigger unless you spam some explorers. But with command deck you really have no time and money to waste on explorers. It should at least draw a whole card when you use a scrap ability in play, not discard afterwards.

Tier 6 High Admiral Jochum (colorless) just can't compete with others. 7-card hand seems strong but not when you have so many starter cards to scrap through. His highest 72 starting authority is no compensation for the lack of functional factioned cards in the starter deck. He also has the weakest standing gambit, which will diminish to none in late game. Maybe the only thing can turn the table is the one-time gambit of returning a card from discard pile to hand. Cool mechanism with the shards, nice concept but not so practical compared to other commanders' starter decks in real games. Frustrating when you only get 1-2 shards each type and no wild card.

The tiers are from my own experiences. What do you think?