My Perfect SET 2-10 Tecktons aren't my forever speakers, however they've given me a lot of joy and aren't going anywhere soon. They were designed to pair well with low powered SET tubes, which had me going down the Decware path. I'm curious how you think these 8 Ohm nominal, 95db, 30hz-30khz speakers would fair with something like your D-Mono's?
My dream speakers are the Devore O/96's (10 Ohm). I assume sensitivity is less important than Ohm matching (the higher the better) for your D-Mono's, is this true?
To your last question, not any more than any other amp. To the former, the class D will drive the Tektons fine.