I have a problem with your numbers. Namely that the big numbers you throw around have no bearing on the build since they require outside sources of Bless and advantage.
It's also not sustainable even if you have those. You have three competing uses for your bonus action: Hex, Hexblade's Curse (when available), and Quicken Spell.
Round one you're only going to have one of those. Round two you'll have the other, but it's not until round 3 you do the peak damage, at which point the target may or may not have already been killed by other party members, so you're back to using your bonus action for Hex, and you've lost the Curse.
I'm not sure where you find the problem
AC 20 with +11 to Hit
Eldritch Blast for 4d10+20 at 60% Chance to Hit for 25.2 aDPR
Quicken 2x Eldritch Blast for 8d10+40 at 60% Chance to Hit for 50 aDPR
Quicken 2x Eldritch Blast + Hex for 8d10+8d6+40 at 60% Chance to Hit for 67.2 aDPR
Quicken 2x Eldritch Blast + Advantage for 8d10+40 at 84% Chance to Hit for 71 aDPR
Quicken 2x Eldritch Blast + Elven Accuracy for 8d10+40 at 93.6% Chance to Hit for 78 aDPR
The damage is respectable at all levels. The damage is absurd from round 3.
As originally stated the build is a boss killer. It is not designed to kill 20 CR 1 enemies its designed to kill 1 CR 20 enemy.
As to your point on bonus actions I would suggest reading the thread as it's already covered.
Boss Damage Combinations at Max Level
Your ability to take down large single targets is unmatched. While an action surge GWM/SS will beat you for two rounds your sustained damage is simply absurd.
Because Hexblade Curse and Hex are both bonus actions it takes you three rounds to come online.
Round 1, Eldritch Blast + Hexblade Curse for 4d10+44 for for 66 average damage before hit chance.
Round 2, Eldritch Blast + Hex for 4d10+4d6+44 for 80 average damage before hit chance.
Round 3, Quicken 2x Eldritch Blast for 8d10+8d6+88 for 160 aDPR before hit chance.
When running out of spell slots and sorcerery points you can cast spiritual weapon at base or higher levels.
Eldritch Blast & Spiritual Weapon 2nd level 4d10+1d8+4d6+56 for 96 aDPR before hit chance.
Eldritch Blast & Spiritual Weapon 7th level 4d10+4d8+4d6+56 for 110 aDPR before hit chance.
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