Well you are clearly not ALL th12 legends either
That's your solution right there, max out your gc points with your th8 and with your th12 do one or two tasks just to get on the board. It's not mandatory to max out cg points. You get full rewards with 1 completed task.
It's about choice. You make the choice of what is your priority in the game. We all know about the clouds and yes I am also waiting for a solution for that. I am currently not in legends with my main but I know what its like and how hard cg is when stuck in clouds.
So ... make the choice...be in legends or max out gc easily in lower trophies or use a mini as your cg ringer while you push with your main...there are ways.
