James, on the one with the as cheeks from 300 out you want to shoot when they are in the inverted V on the sight just below Center. Great for Spits/50's
In a Ki and level shoot straight up the hole the same as if you were right on top of them with any other plane.
The rails are used for rockets and to keep your target ranged in a climb as you follow....allow for lead using those brackets and gauge distance.
The rails are also used for firing 30mil at top of bracket range 250 to 350 out. Once right on top of them shoot for center crack. hehe
Rough drawing:
