I yanked the 25mm Secas and went back to stock rubber just now. Better ride, better stopping power, better traction all around. I'm sure the fact I'm running 50 less psi helps a bit with that first part. Major pedal power efficiency loss, though!
I already have a road bike, and it doesn't make sense to try to make this one too. I figure I'll get in better shape pulling my son with these tires and get it's versatility back.