hope you don't feel like I'm stalking you
I hadn't noticed the unique setup you have chosen. You probably are dragging down the voltage of the dyno too much with so many leds in parallel. Even the best dynos only put out 500 milliamps. I have no idea what the current rating of your leds are, but you may not be driving them to their full brightness. For example, if they were rated at 40 milliamps, you would only be driving them to half capacity 40*25=1000, but you're delivering less than 500.