I use the 252 (half natural hair, half synthetic) to apply my conclear and then I pat it down and blend it a bit with my fingers. A natural haired brush really helps blend the concealer in, just make sure you wash it after every use!
I agree. The 224 is the best since it allows you to buff it into the skin. Just be careful not to use to much at once. Layer by layer and let it set before applying the next layer.