Hi,
for the past 2 1/2 years we have been advising lower town halls to stay low and farm - TH8 would be 900-1200 depending if you want DE or not. However the recent update made alterations to the matchmaking algorithm which changed everything.
There has been (and will be) a movement of strong TH9 and 10 farmers down to exactly there in search of abandoned bases - I can't see how this will change in the short term as it's pretty fundamental to the way the game works.
So....I would suggest you go UP - maybe to 1500-1800 but you would need to do some trial and error. I believe most of the farmers who went down used to be up in Gold.
Good luck

