I'll be happy to share my thoughts as soon as I taste any of the brews you mentioned! Just kidding, of course, but it never hurts to grease the 'ol wheels.
Seriously, though, I myself believe lagers should be fermented for 2-3 months at a consistent, low temperature (the 54 degrees you mentioned seems spot-on to me). At this time, I'd keep it cool, but at a slightly higher temp, like 56-58 to keep the yeast going. Anything out of the lager fermentation range and you risk getting some diacetyl. I'd give it another few weeks in the cool temperature range if you're in a hurry - just my opinion.