Pushing to Champs for Gems (TH 10)

I'm a mid-late TH10 and have put off pushing to champs because I'm a very consistent farmer and never see the benefit. I typically farm in CII-CI. I see a lot of posts about how to get to champs at TH8 and TH9 and all the hoops to jump through, since it's theoretically much easier at TH10 I just had a few questions so I don't waste a ton of time doing it.

1) Should I keep my TH inside and for how long? Except for traps and cannons my base is maxed.
2)What are the most efficient attacking strategies? I know I can get to somewhere in Master III with barch just sniping and getting 50% on weaker bases. I will have 1 of the 2 heroes down at all times as well as my #1 priority is taking them to 40 (Currently 25 BK 28 AQ). All Troops are maxed.
3) I don't want to use a ton of gems, but I don't mind boosting spell factory and barracks to speed things up somewhat, as I work a lot so getting on for 3+ hours at a time is rare.

Not planning any heroic run to 4000 just wanna hit 3200 get the exp/gems and then drop slowly back to Master III/Crystal I and farm as normal. Tips are much appreciated.

First off, with the level of your defenses, it would be in your favor to place the town hall on the inside of your base. The town hall should be placed on the inside of your base at around master 3, because this is where high level players begin to become a normal sighting.

Second, I honestly think you could Barch to champions league. Simply boost your spell factory for the time that you play, and lightning spell at least one mortar per base. (Or more) this will ensure a 50% win every 20m. If this strategy does not work, I suggest using a Balloonian/ Lavaloonian.

Hope this helps