It sounds like your preamp has too much gain for your power amp. Unfortunately, I could not find any useful information in the manual for your preamp. If you're otherwise happy with your preamp contact the company and find out how much gain it has (find out the worst case output impedance as well -- always good to know). If the gain is in the 10dB range, then something else is probably wrong. If it's in the 15dB or higher range, you can use inline attenuators between the preamp and amp.
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