Will this amp trick work for increasing bass performance?

Robert,

I just positioned Two xa60.8's in my listening room. They are paired with Paradigm Personal 7F's and a Premaluna Preamp (EVO 400), streaming Qobuz on Lumin. I am literally 30 hours into burn in. Our specs are not exact, but similar. You're getting a lot of great advice from some qualified folks. To fill my knowledge  gaps, l called Pass and spoke to Kent ( long term technical support), he was excellent to work with. I was looking at all the same amps and he astutely guided me to the 60's. I purchased the from Reno HiFi. Mark is the owner and excellent to work with. I wont speak for him, or the options he will positioned, but I was very confident he would work with me until I had the amp/s I wanted. The bass generated is significant tight and very detailed. I have two subs from the previous configuration that are unlikely participants in the new line up. This is not an advertisement for either, my first exposure to both, just an excellent experience I want to advocate.

I am not bi-amping.
I am going from the amps to my speakers via a high-wire configuration, dual wiring on the speaker side.
If you are concerned about having enough power, remember xa60.8's are class A to 60w then convert. Class A is much more efficent. My strategy in Class A and Tube Pre was to drive the purest most musical combination I could design. Maybe consider bi-amping as a second option if you feel your speakers are not being driven. In my case, I don't  believe it will be necessary. 
Again Kent at Pass was an excellent resource. I believe I spoke to him three times before making my purchase. The EVO's are sensitive, any of the Pass amps you are considering should drive them.