avchd-1080/50i problem

Hello! I have a sony HDR-AX2000 (avchd) , I film in 1080/50i FX and I import from the cam into final cut pro x(I also use apple prores).

Yesterday I noticed that my project properties were incorrect: format-1080iHD resolution-1920x1080 rate-25i.

I filmed in 1080/50i FX (24mbps)... So.. how can I modify my project? Do I must import the footage another time?(I have the footage on the cam)

PS: I can also rec. in 1080/50i FH (17 mbps) or 1080/50i HQ (9mbps) or 1080/50i LP (5 mbps) or 1080/25 p FX or 1080/25p FH... Is one of these formats best for fcpx?

Sorry for my English, I'm italian!!! Write me soon... it is very important!!!