Power Pack C should be fine.
I try to encourage people to continue to educate themselves about electric power systems as they advance in the hobby. Think more about watts/ pound than anything else. The propeller is your load to get to that power level. If your motor can handle the power you need then it's a matter of selecting the right prop. Selecting the ESC and battery are easy since all you have to do is supply the power that you need.
The unfortunate reality is that vendors, including FT, are able to more easily sell product "as a package" for those less-informed and more likely looking for something that is meant for something else. While that business model works for that focus, it leaves the real builder out in the dark since more detailed specifications are now not published with the rationale that these "confuse the buyer" in their search. I don't put stock in that since you are also seeing published specs like kV, stator dimensions as well as pole configurations. Not publishing the power rating is just crazy to me. Regardless, the "suggested prop" is helpful to get you in the ballpark and go from there.
The reality is that 1000-1200kV is about right for this airplane and 300Watts should be sufficient for it given the wing area and weight. Think 300watts total at 100 watts/pound and you have a stable airplane. I really have no idea of the weight just yet but it's a good ballpark example.
My Tacon motor should handle 500W easily so being able to swing a larger diameter with a lower pitch should not be an issue. Should give gobs of thrust to do stupid stuff, even in crazy windy environments that we've seen at FT events (anyone remember FF TX?)