Make boosting Barracks/Dark Barracks/Spell Factory/Dark Spell Factory more efficient

Hello,

I love using gems to boost all of my troops including spells so I can have more raids in short time.
But I found a problem that sometimes there will be a point that all your troops is ready but your clan castle troops is still empty because it haven't done cooling down.
In the higher trophy (I'm currently at 3950+ trophy), everyone using war troops to do the raid (there no giants-goblins, no barcher, no bam attack at my village since I reached Champion) and clan castle troops are crucial for war troops.

My request is pretty simple, please make another clan perks.
Level 11 clan perks that contain at least donation request time: 8 minutes.

My clan is now currently at level 10, I'd be glad if the 8 minutes request time is added to clan level 10 :p
But clan perks level 11, I think, is the easiest solution for us to efficiently use our gems for boosting.

Thank you.