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Synch. bank definitely is a hard nut to crack. I had the Amazon Store Card in 2012-2013. I was rebuilding then, not very many cards and I revolved a lot on the amazon card with super high apr. I only once received a $150.00 increase at the 12 month mark.
I opened up a gap card last year in March, $200 limit. I used that card every month, paid it in full always and never let a balance report. every 4 months I got increased, then in February 2015 I hit them up on chat and received a HUGE increase.
Opened an Ebay MasterCard the otherday and was approved for a $1500.00 SL. If I could do things over, I would not have opened up my Synch. bank cards when my FICO score was lower than 660. One, you are not going to get the MC/VISA versions and Two, credit solutions is not going to help you out will you have put in the time with them and shown responsible use of the card.
I am always amazed by how many people have such luck with credit solutions, its a total YMNV... Also, they do seem to have cycles throughout the year where they are GIVING. I have noticed it in the first and third quarters of the year. Keep using your cards, low utiization and they should show you some love.