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^ Agreed.
You can recon but it will be a HP.
Lenders aren't just going to match other lenders because you have a certain limit on another card.
Let it be.. It looks like you have around 30k credit with Barclay's across two cards now? That is pretty dang good for them. They aren't known to want to be top giver out of all your lenders. They look at total exposure much like many other lenders do and you have close to 30k with them. Obviously you can move some of your limit from your Arrival+ to it if you would like they would do that with a SP or no pull at all.