Ok, first off, are you really worried about the difference between 25 watts and 50 watts?
You understand that the difference is only 3db? In order to get TWICE as loud, you need 10X the wattage. So I could see if you were worried about a 250 watt amp only putting out 25 watts. But 25 to 50 is such a small difference to hardly be noticeable in a live setup.
That said, if both your speakers are working, then you're playing the amp at full output...so don't worry about it. Which, (not to muddy the waters) I believe is probably closer to 40 watts output, not 50. But as I said, you're splitting hairs at such small wattage difference.