Just get rid of ISO-8 from the game
ISO-8 is such a hard resource to accumulate for players that do not whale out on cavs or grind arena 24/7. 6 stars and 5 stars need so much iso to level up and it is literally the only thing holding me back from taking 7 champions to 6r2 and 5r5. not catalysts or gold but ISO. 4,5 and 6 star dupes give barely any iso; its enough to level up a 6 star less than 10 levels. I propose that the amount of iso that we get from dupes of 5 and 6 stars is doubled, or just get rid of iso completely because it serves no purpose other than slowing down the process of rank ups.
Thanks for attending my bad TED talk.