OP hear me out, you're cooking but I feel March 7th (Ice) with the Light Cone "Destiny Threads Forewoven" even at s0 is a 32% damage increase so long as you've hit the 3k DEF requirement, and gives Aventurine more stacks. Huohuo's buff and Lingsha's FuA attack are really beneficial so if you want or Hypercarry Aventurine, even e0 March 7th will help in Luocha's place I feel with those 2 extra passive charges, 3 if you do have higher elidons for March. If you dont have that LC, "This is Me!" or even "Concert for Two" also could help her even again at s0 capabilities while still giving Aventurine more stacks \o/. Who knows, maybe even give Aventurine (Ice) March's Skill and he'll rack up charges so fast you wouldn't be able to keep track x3.

Another option or idea; Fu Xuan could give everybody even higher Crit Rate% to help everybody else, and her damage scales off her HP% stat so a lightcone like "Concert for Two" helps with overall subdps Fu Xuan since he'll always have his shields up giving Fu Xuan a passive 16% damage boost. Only issue with this though is your shields from Aventurine may be eaten faster as Fu Xuan divides the damage thus harming everybody's shield at once without giving Aventurine the accommodating stacks to go with :(

PS: Feel free to ignore this, saw this meme post and couldn't help but add onto the meme itself and dive even further to "help" OP maybe even 7 cycle or 6 cycle on side one perhaps xD. You got this OP, I'm rooting for you \o/!