Aerial Acoustic 5Ts vs Cheap Towers

I have a modest system down at my cabin. NAD C316BEE integrated amp with 40 wpc. It is driving a pair of Polk Audio Monitor 7 towers (tweeter, mid, 2 active and 1 passive woofer in each speaker). The room is fairly large at 20x20 with vaulted ceilings.

Recently I inherited a pair of Aerial Acoustic 5Ts. By all accounts these are superb bookshelf speakers and sell new for over $4000. They are mine to keep if I want them but if I sell them the money goes to the executor of the will which I'm fine with if they don't work out. Other than using them at the cabin I have no other real need for them.

I'm here at the cabin now and I've wired the 5Ts up to the NAD. And while they sound good, they do not sound as full and room filling as the Polk Audios ($180 used for the pair).

I have only moderate experience as an audiophile. Is this normal? Is it me? Is it just a matter of the 5Ts not able to move as much air as the towers and fill the room as well? Is the NAD insufficient to drive the 5Ts properly?

Unless there is something obvious I'm missing I'll just leave the Polks here and sell the 5Ts for the estate. The cheap Polks make more sense at the cabin anyway as they are cheap, vinyl wrapped and the 5Ts are gorgeous piano black that is just going to get dinged up down here. If there is something I'm missing I may keep them.

One potential solution is that I have a large B&W powered sub at home that I could pair with the 5Ts but that's just more stuff to stuff into the cabin. The estate came with 2 JL Audio powered subs but I already have a potential for a buyer on those.

Any advice appreciated.

George.