OK, I'm a bit slow compared to many on here, and until now I've resisted calling Credit Solutions. I really don't like dealing with people on the phone unless I just have to, and my three Synchrony cards are sufficient for my spending at the moment.
That being said, I've recently got a 'bump' on my TU, and I know that when my new accounts from a few weeks ago start to report my score will take a dip for a few months. Also, when I tried to get my four-month CLI on Lowe's a few days back for the first time I was told 'no' - and the denial was due to a credit report from February (per the letter) when my score was nearly 70 points lower.
So, armed with the CS number provided a few minutes ago from my friend JamP (and coasting on my earlier success with a Citi CSR) I decided to 'bite the bullet' and make the call... the worst they can do is say no, right?
I asked for my limit to be increased by $10k to a new credit line of $20k... after a few minutes the CSR returned and told me, "Approved!"
No more messing around with that janky "button"! 
My account will be 12 years old next month, and today I "thank my lucky stars" I didn't close it out of frustration when they balance chased me back around 2006 (I was never late with Lowe's, but I was going through a job loss and other accounts were reporting as late at the time).
This is now both my oldest account, and my largest credit line.
Special shout-out to JamP for providing the CS number he used earlier for his increase on his Sam's Club MasterCard... after I get my own Sam's Club MC PIF next week I plan to call back and get that one 'bumped' to $20k as well!
Side note: I asked for $20k and it was granted, so I know there's a chance I may have qualified for more. That's OK, though... my income is modest compared to many on here, and with my resources I feel that going any higher than $20k would be pointless.