Adding amp to integrated amp

I tend to agree...one has to triple their power just to obtain a 3db gain..I feel your MH is more than adequate to drive your system...for the record...I did the same experiment in a NAD/Belles system years ago...wasn't the quantum leap I expected...but...YMMV

Thanks guys for your time and reply.Bob

Martin Logan speakers dip down to fairly low impedances, however, that occurs at high frequencies and it is not an issue for any decent amplifier.

Since you plan to use your integrated amp's pre-amp section, the answer for your last question is YES.
I cannot answer if your MH preamp is better or power amp section is better. Previous owners or that amp who have experimented can answer that. Or take your amp to a dealer of the power amp and do a test in his system.

I had done the same thing with my NAD integrated. But I had used it's power amp section and replaced the preamp with a TVC. Eventually sold the amp and have the current config. Good Luck.