Will this amp trick work for increasing bass performance?

One other very important point...finding the best bass is also extremely dependent on the location off the bass driver in the room as well as the phase adjustment of the bass speakers. The room has bass cancellations and that you can't eliminate. However these cancellations are movable especially at the listening area and it must be corrected for optimum sound.

Once again the advantage to a movable pair of subwoofers is the only way to go if you're looking for exceptional sound. Once positioned in the best 'location' for your particular room, then they are individually 'tuned' by way of phase adjustment to help eliminate (minimize) any cancellation occurring at the sweet spot.

There will always be wave cancellation in a room. It needs to be dealt with. Stationary speakers in a set location unfortunately give the least amount of options for correction of these dead zones. You can NOT power or EQ your way out of wave cancellation.

The best sound is not achieved by placing the speakers in the most visually appealing room location. It just doesn't work that way. Physics rules.

“In my opinion it might make more sense to use equalization which will allow you to tailor what you’re doing in the bass region with a fair amount of precision, assuming your speakers already have adequate extension. “

you might consider this:


https://www.decware.com/newsite/ZROCK.html

Heresy below:

1 - I find Pass does not so well with these speakers and low impedance.  A single amp from Ayre or Luxman may do better, not to mention a host of Class D amps.

2 - If you do insist on bi-amping, consider the Vandersteen trick, and put an EQ in series with the bass amp. 

3 - Of course, bass is greatly affected by proper room treatment.  Too many mid/high frequency reflections can tilt the entire response the wrong way.  Room modes can make the bass sound tubby or overbearing. Always a good place to start.

Above all, please yourself.