You have some great source and amp gear that should allow the Personas to shine. But given your amplification and smaller room size, with the much more efficient Personas, you may end up playing at lower volume settings than usual. Not a problem if Krell sounds good at lower vols, but something to be aware of.
In a 16 x 24 ft room (more similar to OP's room) and an Ayre Acoustics AX-5 TWENTY, the Persona 3F's have space to open up and yet still can provide plenty of compression. I can get to a max reasonable volume with the Ayre set at only about 25%.
Another factor is the Persona's rather wide dispersion profiles for midrange and highs. Its's uncanny, but my " sweetspot" ended up being broad and pronounced.
Hope it works out for you and @average_joe .