Only thing I see is the matter of speed and upgrading by silhouette difference.
If Speed is 1 and the sil difference is 3, do you roll RR or RPP?
If you "upgrade" by the difference, it's RR. If your intention is for it to be RPP, you'll need to adjust the language. Maybe something like:
"When making the Piloting check, the difficulty is equal to the target's speed, or how many points of silhouette the target ship is smaller than the attacking ship, whichever is higher. The lower of the two values indicates how many times the difficulty of the check is upgraded."