Why would 2 schiit aegir amps sound the same as 1?

My setup is forte 3s, schiit freya+ preamp and 2 schiit aegir amps.  They accidentally only sent 1 amp last week so I was able to trial my system for a week before my second amp came and I switched the aegir from stereo mode to two monoblocks. Yes my speakers are high sensitivity but I’m surprised I need to turn my volume dial to roughly the same spot on the dial.  I was definitely expecting more going from a 20 watt stereo amp to two 80 watt amps.  Overall I’m happy with the sound but maybe I just don’t need both amps?