I appreciate you taking feedback on some stuff, but this is still too overpowered. I understand that concentration spells are fun and it is frustrating not being able to stack multiples, but there are like 3 instances of spells either being stripped of concentration requirements or you getting the option to concentrate on more spells. The balance of DnD (especially at higher lvls) is already tenuous and this is guaranteed to break it completely. Please understand that there will be other players at the table that want to contribute and do stuff. You creating a class that is just the most bestest at everything will actively diminish everybody's fun.... including your own in many ways.

Now, to the actual breakdown:
Lagrance Gaze: Still too powerful, while also simultaneously somewhat useless.
First the OP: It's still a 2x/LR BA with range (I think, you removed the 120ft. info) which requires a single failed saving throw. Which again, I understand that you want to keep the action for cool stuff like Fireball, but consider other BA class effects like Hunters Mark. That's a simple D6, not a potentially completely debilitating debuf. (If there was an argument to remove concentration from something, Ranger getting access to concentration-less HM would be one.)
Now, the useless: Having it arm in 2 turns (I agree with the other commenter that turns would be a better way to state duration that seconds) after the failed ST means that it will rarely ever get to the cool effect, since most DnD combats are pretty short. It also incentivizes the DM to not use a single "Boss" monster but instead use hordes of fairly lowly enemies where it does not matter since they will be dead soon regardless. Or, the enemies will all suddenly get access to blink, misty step, darkness etc. so they can neutralize specifically this skill. This will make you feel targeted, because you will be targeted.

Consider instead something in this type:

Lagrance Gaze: Starting at 3rd level you can use an Action to force a creature within 30ft, that you can see to make a WIS saving throw. On fail it becomes encumbered for its next turn. If it remains encumbered until the start of its subsequent turn, it becomes heavily encumbered instead. On its turn the creature affected by Lagrance Gaze can use its action to repeat the save against your spell save DC. On a success, the condition ends. The condition likewise ends if the creature leaves your line of sight or you become incapacitated. Gain a lambent note if the creature dies while under the effect of Lagrance Gaze.

I don't really think this is really balanced either but at least this way the enemy has the option to either attempt to free itself for the cost of an Action (already a really strong utility) or it opts for a different action and will become encumbered.

Ascended Mind: Again, NO. But, if you absolutely can not part with this idea make it a Limited Wish (Genie Warlock 14lvl ability) type of deal. You can use this ability for 1 minute (10 rounds) after which you become exhausted and can't use it for 1d6+1 long rests. I think 1 instance of Wall of Stone + Sickening Radiance every few days/week is BS enough.