i guess nobody has any input what about a 4 blade prop
You asked, would a new prop perform better?... Are you looking for more speed? more power out of the hole? better fuel economy? planes at lower speed?... You and I have a similar boat (a 2013/2014 2520 XLD). It came with a similar (same?) prop as yours, even though you have the mod-V, and we have the deep-V. Ours is the stainless steel, Saltwater Series II.
And, 15 X 17 17-T is marked on the prop although the original spec sheet shows it as 15 1/2 " Diameter X 17 pitch. I don't know what the 'T' means. (can anyone tell me?).... I am happy with how the boat performs with this prop, but I too am curious to know if there would be improved performance (Meaning better mpg) with a different prop.? (4-blade, different size/pitch) Or raising the engine? Or adding a foil?. Any change will be a compromise of giving up something, to gain something else. I agree with a lot of the comments saying top-end speed in not a priority. (I've topped out at 44 under ideal circumstances, but I don't have a need to 'cruise' over 34; I usually run 30-32 getting 2.0-2.2 mpg). I would like to be able to stay on plane at lower speeds, but I don't know if that is a reasonable expectation with the deep-V...
It's a time consuming and expensive (I don't have access to 'borrow' different props) exercise to experiment with different props, and although somewhat helpful, other peoples experience with prop changes and performance may not apply to our boats (too many variables)....