First off I love the boosts for barracks 4x seems to really be about right. Spells on the other hand seems kind of weak. I would love to see a varabile boost. Something like 4x 10gems, 6x 25 gems, 8x 40 gems. This would make sieging much more enjoyable to me.
Clan castle troops are extremely valuable on both offense and defense. Most clans have ratios you need to maintain to not look so greedy. If you running a comp like baa donating is difficult to maintain requests. If you make a special troop for donatimg you have to wait until someone requests that troop. An idea I had is for a clan to have a group castle that can hold troops and when people need troops they can just pick out what troops they want. Say it holds 10 troops per member in the clan for a total of 300. If no one takes the troops in 30 minutes the troops get cleared from the castle. If there is nothing in the castle they want they can request the current way as well. You also can only take troops every 20 minutes and can only give troops every 20 minutes. Certain details would have to be worked out but that's the beginning of the idea.
Thank you for reading.
Red from purple flame.