I wouldn't expect TH8 to regularly be able to get 3 stars from TH9 bases.
Any properly built TH9 base should be too tough for a TH8 to 3 star unless the TH9 is new and the TH8 is near maxed in troops.
It was already too difficult to dragon a TH9 base with 4 lvl6 AD even before air sweepers came along at all.I think almost all th 8 using dragon when war and when meet th 9 with 4 AD lv 6 and 2 air sweeper it's too difficult



