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I was approved for 2 revolvers - one for 2k, other one for 1k. Does it make sence to try 3*CLI upon activation on both cards or only on BCE that has 2k limit?
You can try for a single card after 180 days from your last CLI.
If they approve the 3X CLI on your 1k card, you will have to wait 180 days for your next try in one of your cards. So it makes sense to try with the 2k card.
If they don't approve the CLI you will have to wait 90 days for your next try.
Nobody can really tell you a "strategy". It's not really a game. It's based on your file and what it will support. Nothing more or less. There's no way to beat the system with a strategy.
That said...once you try and are approved at any point, you have to wait 180 days. if declined it's 90 days.
You can try whenever you want and take whatever advice suits you best. To me, establishing a history with a lender is always a better option, even if it's only 3-6 months. Show a good payment pattern. Asking for a CLI on activation could be a bit too "ambitious" but that's just my opinion.