I disagree. I think the Kaos is a good and Honest airplane. If you have flown an Avistar for a year, then you probably are ready for a Kaos.

But I would recommend a good 60. Airframes determine how fast an airplane goes, not engines. As the plane goes faster , the drag increases in a non linear way. It takes much more horsepower to go just a little faster. Now, a larger engine will increase the climb performance, if that is what you want. But it isn't neccessary.

If you get an experienced pilot to test fly your Kaos and help you set it up properly so that it is docile and the controls are somewhat limited, you will enjoy it very much.

It goes where you point it. It doesn't pull itself out of a dive. It doesn't roll itself right side up. It just keeps going where you pointed it and in the attitude that you commanded. To me, that isn't unstable, to me that IS stable.

It is a larger jump in performance than most people are willing to take. But that doesn't mean that it is wrong for you. We are all different. The people that fly with you and know your skill level can advise you better than folks across the country. I consider the Avistar a great trainer. One year with an Avistar is very good experience. My guess is that you are ready.