Same as Coldfury, I only play on boost (so 2 hours at a time). This is plenty of time to manage my trophies.
If I was going to logoff in-between raids then I would place the TH inside to help maintain trophies.
That's awesome. I love it when you get those hot streaks. On Saturday I had it the other way. Couldn't find anything over 600 DE, gave up raiding and just donating for the last hour. It's normally stable but can get very Hot or very Cold at times. Can't let it stress you.
This is the most efficient way. Now i'm farming in C1 with my level 40 queen I'm making 60k+ every 4 hours.
I farmed both heroes to near 30 with loons/minions doing the same as you.
Trust me, this method is more efficient, more consistent and larger profits. It's also less stressful, less searching and less reliant on collector bases.
Seeing as it takes hundreds of hours to max heroes in my opinion it's better to farm DE in Crystal with no DE troops, overall.
TH9s will struggle more than 10s. I'm pretty much attacking any TH9 with DE not in the dead center. Or if their TH is outside I'll attack any TH9. 6 archers on their TH and then a full army getting to the DE storage. Normally 1 rage is enough.
If a TH10 can play in sessions then TH outside is fine, otherwise you might benefit from inside. However there are a ton of DE farmers about there so make sure your DE storage is heavily protected. Next to both Infernos (multi) is a good start.





