Expanding propeller exhous channel

[pellesmil]

Hi
Have installed my new prop. today and se that the exhous channels are smaller in the new prop.
The new prop are a Hustler alu. (13-1/4 x 17) with seperate rubber boss, so that i can change the prop. only for a low cost.
What i wonder about is if eny has done eny mod. like filing up the size of the channels.?
would there be eny power to gain by filing it up?
And ofcourse would there be eny powerloss by reducing the channels?
Here is the new generation Hustler prop. should be better as for exhous flow.
I would guess the 3 channels on the original prop. has a dim (each) on 15mm x 45mm, the new is quite smaller.
The engine is a 75 hp Yamaha 2 stoke

Thanx for answers

Will post some pics later

[pellesmil]

Some pics. of the beasts
yepp as y can see the channels are quite bigger and would probably let more exhous out on.
Yet i dont have eny complains as for the new prop. design, last year i tried a new 19" (same pitch as the original)
the rpm. dropped atleast 1000rpm.
so i guess there are quite a bit of slip in the old worn prop.
I am quite eager to try my new 17" and see if i reach 5000-5500 (max)

Yokidoki