I have spent a lot of time with the Ayon Spirit II and III amps, and have heard the Cornwalls many times. I don't think you will be disappointed with them at all with your Cornwalls, which are a VERY efficient speaker. The bass with the Spirit amps is quite strong and powerful, if you have a speaker that works well with them. The Spirit amps will bring out all the flaws of your speakers and source components, and make them quite evident. The Cornwalls are not the most neutral sounding speakers out there, so be prepared! If you don't like what you are hearing, it won't be the amps fault.
The Spirit amps, when run in the triode mode, sound fantastic. Lots of detail, texture and attack, with a big, 3-D soundstage. They put out a clean 30 watts per side in triode, and double that in pentode mode. The pentode mode gives you more punch and slam if you need it, but as with most tube amps that are switchable, you will give up some of the finesse, clarity and "air" when running pentode. I have owned many great tube amps and solid state amps over the years, and the Ayons are hard to beat. They have also been very reliable, and have great speaker protection circuitry if you have a tube go south on you.