Max for TH8 is lvl3.
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continue your drills to 11 you wont regret it .. knock em out the way
I left mine until i was ready for TH10 then maxed them as my TH upgraded. Never regretted not doing them sooner.
As far as I'm concerned, anyone who hasn't maxed their mines and collectors should be banned from complaining about loot. I see bases with low level mines and collectors all the time, just think of how much more loot would be in the system if everyone maxed their stuff!
Max defenses first.
If you always get enough resources to upgrade a defense then mines and collectors should be your last thing to upgrade
My approach for now is to simply use one builder to build/upgrade collectors at the beginning of a TH upgrade just to make the new ones somewhat productive. This only takes a few hours. Then I focus all of my builders on defenses/attacking/containers. "Maxing" collectors is what I do last. What good is dedicating early TH builders to collectors if you're just going to get raped by attackers every time you put your phone down? All the maxed collectors will be doing is making your base more palatable while you are gone for long periods of time. We all love seeing full collectors outside of walls, our enemies do, too.
Collectors have low cost, if compared to guns. In short, if you have enough gold to keep builders building cannons - you don't need collectors.
Upgrading them is a good idea. But their priority is low.