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0-markymark-0 , my road bike has much less stopping power than my 20 year old mountain bike, but I can still lock the rear wheel on the road bike or bring it to a stop using the front brake with the rear wheel off the ground so there is still plenty of power available.
What STI's do you have? I ask because I recently took some good callipers off my road bike which always hard a sharp feel and put them on to my wife's bike (I was upgrading the callipers on my bike). After the callipers were put on her bike the braking with them became quite spongey because the Shimano 2300 shifters pull a different amount of cable than the Shimano 105 shifters on my bike which are Super SLR. You could also call the spongey feel progressive and luckily it suits my wife as with slightly weaker hands there is less resistance on the brake levers so she likes them like that.