McNally wrote: ""Ivan was a marathon paddler, not sprint. He is a big, powerful guy, famous for having a very strong fast finish in races."
I did not know that, but since the OP is talking about short distance races 1.5-5 miles, his advice might still be sound in that case. I find that I can pull as hard as my muscles will allow with a Braca XI 705 during a 6 mile race. I might be slower with a larger blade.
I do notice that sprint paddlers use larger blades, like one top woman uses a 745 in the Braca VII and the top men use larger blades than that, but since I don't have the muscle or training for that a smaller blade makes more sense to me. YMMV.
trying as many as possible makes sense to see what is best for you, there are many different sizes and shapes out there.
Nelo 550L, Streuer Fejna, Nelo Viper 55
Braca XI 705 EL blade, 17K shaft
Braca XI 675 marathon blade, 19K shaft
Braca IV 670 soft blade, 19K shaft