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?
Does it sound the same to you or just have roughly the same volume? Using balanced into monoblocks should yield less noise and better channel separation. I would think that would be the main attraction. I recall a Steve Gutenberg video that compared 1 to 2. If I had a balanced out on my pre I would consider it for those reasons rather than any power requirements. I’m sure I already have adequate headroom with 1. 

Found the video - https://youtu.be/mj6uuRFlRLs
I think russ69 might have made the incorrect assumption that the OP was using both amps in stereo mode and bi-amping (28x4?).  From what I can see, OP's talking about one stereo amp vs. two monoblocks.  That said, the power difference still doesn't seem that great, but the channel separation and slightly better dynamic headroom would be the two advantages I can see with the monoblocks.  That is not something that you might notice when comparing volume levels, but try some music with a lot of dynamic range and see if there's any noticeable difference.
yes @rcprince I’am using them as monoblocks. After more detailed listening the sound is more “full” and I get a better base response but it’s a smaller change than I would have guessed. The single aegir was already fantastic with the high efficiency speakers.  
Going from a 30 watt amp to a 300 watt amp gives a 10 db increase in headroom - if your speakers can handle the extra power! 10 db is perceived as "twice as loud"!