HELP! What Speakers For NAD C352 AMP advice please!

I have recently replaced my NAD C3130 amp for the NAD C352 but have found that the music sounds confused and not so precise. Im wondering if its the speakers I have which are KEF IQ1 which sound excellent with my old amp. Im wondering if espeakers are not up to the task of the new amp especially as its double the power in wattage. I was wondering if the KEF IQ5 would be better or if anybody has any other suggestions

Many thanks