Heroes

Upgrade both heroes at once. It cuts your upgrade time in half. "But then I won't be able to farm de." One might say. But if you're using a good Gibarch (I use 16 giants, 12 wb, 56 barbs and 60 archers) you'll be hauling in plenty of dark elixir. Also I like to bring 3-4 heals, and plan on using 1-2, but if it is needed, I will use a third and rarely a fourth. I also bring a poison. Always lure of you can, and if the poison can kill the troop by itself, use it. If it can't, bring the troops over and kill them. (Don't forget a level 1 poison can kill all wizard levels, and bam, goblins, and pups). If you can't lure, just use a your poison as the troops come out. Also, never use more than 2 giants on a lure. It will weaken your army too much, and it would be more worth it to be ready with the poison.

Walls

My number 1 tip with these pesky lil guys is to not try. As in while you're upgrading stuff, always leave a builder open to do a wall here and there. When you're grinding away at heroes, upgrade walls. If you don't focus on them, they'll be upgrading faster than they seem. If you're a max th9 besides walls just go to th9.5. When your town hall is upgrading, upgrade walls, and when your town hall finishes, do heroes, lab upgrades, spell factory, heroes, or just pretty much offense. And leave a builder open to do walls as your offense progresses.

I hope this helps. Walls and heroes seem to be what annoy clashers most when it comes to grinding. So I thought I'd help my strategy that makes it a little less hard.