Good Luck, with a nine year old account there should be plenty of offers available! Sometimes you have to talk to someone a bit higher up the ladder there. I have been told that the higher up you go the more offers they can see for your account! As in if you push the issue enough then they will find someone with a brain to help you and who has more power to PC you.
The EO should do the trick too! When you talk to them make sure you tell them you want a different credit limit too! Make it higher than any limit you have now. When they ask you if you will accept less then tell them the highest limit you have on your other cards! In the worst case scenarion they will probably counter offer something much better. If you have an AF ask for that to be removed. Push to keep you interest the same if it is lower than what is currently available. (If you carry a balance and interest is an issue.)
Once again Good Luck.
It is by will alone I set my mind in motion.....
Always follow these rules: Only take a HP for a new account. Always use the best rewards card for that reward category. Don't close a card unless you know you really should. Never use more than 35% of a credit limit. Recon as much and as best you can. Use the introductory period to the best advantage. Get the signup bonus. Whenever possible PIF or balance transfer so you pay less in interest. Never give an excellent rating when it is actually the norm. Always look for a discount as more is always better.
Always accept candy from strangers because they have the best candy or from people you know have good candy.
gl! 
