If you have too much overall gain in your system (gain of preamp plus gain of power amp) you may have a small volume control range making it difficult to adjust volume (for example you are at 9:00 at desired maximum volume). If that's the case you can reduce the gain to 23dB to get more volume control travel making fine adjustments easier.
The sensitivity of your speakers is a lowish 86dB, so depending on your listening volume, room size and distance from the speakers, I think the 4BSST2 is a good match with plenty of headroom for peaks.
Steve