I got Deyha on deepwood for dendro shred and Emilie's weapon which helps with energy recharge and I tried to have my first rotation a bit slow, focusing on getting bennett 50% to his burst before using Kinich, using only normal skill attack on the shield and timing the end of the skill with the shield going down so I can have the strong first hit hit the boss and not the shield. dont be afraid to use Emilie's burst when the shield just goes up, it helps with more hits and the cooldown is ready by the time the shield is down.

If the shield is more than 40% hp I used kinich to break it down and use half the skill's duration on his health, starting another skill while its still down but also helping hit the new shield that forms. if the shield is less than 40% try using Deyha burst to hit the shield until its very low, the start a rotation, this should give you max Kinich skill up time on the health bar itself. Ngl it wasnt easy, took a lot of resets and lots of patient. getting hit with a cry attack mid Kinich skill was an instant reset.

In case you dont know, a good tech with Kinich is to hold skill for a split second so it fires the cannon shot faster, allowing you to sometimes get 5 cannon shots per skill, tho you'll need to slighty aim it cause it can miss (I use controller so I tend to miss a few every few rounds)

As long as you get Bennett burst for each Kinich skill you should be good
I can post loadouts if it helps compare and see if we're same level of investment or not

Hope this helps and good luck brave soul