We had a couple of guys in our clan that sat around tenth on our war map and had level 20 heroes and they regularly 2 starred the number 1 or number 2 fully maxed bases that our ground attackers with better heroes couldn't take out.
They used and still use 3 hounds 24 loons 3 wallbreakers and rest minions, and it is very effective.
As for 3 stars on maxed out th10s. Lavaloon was very very powerful pre air sweepers. And i think the biggest problem was that it was too easy for the lets say "pro practicing" clans to use it for 3 stars, but it was still fairly difficult to do for those of us who didn't have practice. You can still 3 star with golalo if you are good and have very high heroes.
I feel the game is much more balanced than it was, although I do feel since the poison spell now allows for an extra elixir spell, I am seeing many poorly executed th10 attacks getting 2 stars that in the past would have been complete fails. But on the other hand I think ground attacks at th10 needed a bit of a boost due to skelly traps and the countless versions on that open box like base that was just copied and pasted from clan to clan every war.




