tcbofade,
I am not sure what to tell you. I have been between the two extremes that have been mentioned in this thread when I got love from GE. My biggest increases in CL from GE cards have come during constant and light usage, with about 90% PIF. My fico util probably has not gotten over 30% since I started monitoring and got my GE cards. GE has not shown me any love when I have not used the cards. They only show me a little love when the card in question has a high balance.
Examples... High first: Amazon store card has given me decent increases, but last year I charged an entire home theater system on the card and this year I got my smallest increase to date, util on that card about 80% (all 0%, where the devil lives 
) Similar situation with Walmart store card, I got my smallest increase when I was over 50% on my CL, even though that was all also 0%.
mid... When I brought my Walmart card down closer to the 25% range I called because there was an error on my card. They corrected the error and offered me an upgrade to Walmart Discover, almost increasing my CL 300%. Funny sidenote, after my store card was closed, I got a notice that my CL on it was increased.
No balance... I contacted JCP for an increase when I thought it was about time (I was gardening) and I was rejected due to lack of payment history. I had not used the card in almost a year.
If you want my .02, I would suggest you bring your overall util down to 30% then hit up the GE cards for increases. You should have enough payment history that the internals will look good to them and with a higher fico the externals will match. I would not be surprised to see your CLs with GE jump 100 or 200%. You will have shown them that you can dig yourself out of debt and they will want to give you the chance to get back into debt.