Okay, I think what you are running into are plants that just grow too fast in CO2. I'd imagine you like the grouping look but hate the constant cutting. I know I do. I've found that sticking to easy to medium difficulty plants and sticking to slow to moderate growth speed is going to make your life easier so you can enjoy the tank more. All my suggestions will be around ease and speed.
Any Bacopa, but Colorata is amazing
Bacopa Salzmanni
Ludwigia Natans, Super Red, Ovalis. Stay away from Ludwigia Repens.
Val Leopard or any val really
S. Belem
Myrio Green or Foxtail. Though on the faster side.
Almost every Rotala, wallichi and bonsai can be tricky.
Tiger Lotus, dwarf Lilly, Taiwan Lily
Giant Baby tears
Pogo Helferi
Pogo Erectus
Cryptocoryne all kinds
Spatulata
Creeping jenny
Try to stick to individual groups vs the same plant in several places.
Also mosses are nice, but need trimming more often than I like.