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As long as you have waited for at least 6 months sometimes 12 depending on the card but in your case I think 6 is ok then I don't see any problem at all that you shouldn't get the 10k. You can request up to 3 times your current limit so if you have 4k now you could ask for up to 12k CLI. Now they may come back with a counter offer but that's how the game is played!
I did not know about that 3x your credit limit tip! That's excellent!
Hopefully I won't get so much push back but if I do I can always just apply for a card with a new promo apr!
Thank you for your input!