Yeah if you're sitting on a ton of DE it can be a good idea to rush to 9 to get the AQ going but the 2 best farming army comps I've found for coring DE storages is Loonian and GiBarch both of which are much more effective with L6 troops.
It sounds like you farm a lot and can do the TH8 catchup at TH9 just know you won't have TH7s to raid anymore and it will be tough in the early going v 8s & 9s until your ACs and troops are leveled up. You can always throw an upgrade in the lab right before upgrading the lab so you don't waste the time.
But whenever you do go in to TH9 do it with at least 5M G / 5M E / 60K DE - just my opinion and if you can go in full even better but those levels will make the transition much smoother.
Just get giants & loons to lvl5 & build the gold storage (most of it can be done while upgrading TH) & you're all set for TH9. Don't worry about loot, if you are as serious as you say you are then you won't have any problems keeping all your builders busy all the time & also have level 10 AQ in about a month.
Also focus on going the 8.5 route, as it will give you an advantage in war, up till you get decent war troops done for TH9. Do loons to 6 if you concerned about war too much & add it for backend defences with gowipe, probably would get you 3 stars on a lot of bases at the beginning.
Journey of a Rushed TH9
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TH8s can't defend anyway against TH9s. Those lvl6 giants just roll over you. So whats the harm in going to TH9 & getting the extra offensive power & places to dump your extra loot. When you don't have loot what will they attack you for. And if they do attack you those extra 25 walls & some of the traps will provide just that little bit of extra defence that a TH8 can't provide. So no loss for you on either end.
Journey of a Rushed TH9
Looking for an adult farming clan with a chilled atmosphere?
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You could spend your elixir on ythe other Barracks and get that to 4 and save up enough DE to get your Golems done to 2. The more you do now, the less you need to do at 9. If you skip getting youe DE troops up at 8 (Hog to 4, Golem to 2, Minis etc ...) you won't do them at TH9 as you now throw all your DE into the AQ.
Do the work now so that TH9 will be easier in the beginning.
Personally i dont think its a good idea to rush no matter the circumstances but i can tell you that once you get gibarch to lvl 6 and your army camps finished you will have no problem at all with loot
Max th8 goin to th9| lvl92| clan:Amateurs|GG 250 MIL| EE 248 MIL| HH 345k
I maxed th8 n went to th9 with full storages..got queen straight up upgrade lab and spell factory and started an xbow as soon as the th clicked over to 9 but I thought it was worth maxing due to the th9 loot penalty..eg if u farm gold 1,2 and 3 a lot of th7 and 8s..at th8 attack a th7 u could still get a good loot amount where at th9 attacking a th7 full storages n collectors half full ur lucky to see 150k max to raid from it..so yeah up to u tho
Town hall: lvl 9
level: 115
Highest trophies: 3101
GG..505mil HH..1.4mil WALLS..235 LEGOS...15 lavas
Mainly farmer..max th8 n pushed to masters befor i got th9..Now back to farming for th9