I actually like the flame show in a cat stove better than a non cat tube stove's gas grill like flames.
I agree those flames look good but are you running those stoves a bit on the warm side? I get loads of flames with the air all the way down on this stove and my cat stove usually was run very low with very little flames. I found my cat stove was most efficient run with little flame and efficiency was lower with a good flame show..
Ray