I will direct you towards the authority figures on that particular subject, @Aldrith_Shutaq and @Gah_Matar .
I hope they will forgive me for posting these, but the best way to learn how to fit a specific hull is to figure out who uses these ships a lot, and see what they’re flying. Both of these guys fly Amarr ships in Faction Wars on a daily basis, and have done so for several years. I’d consider their wisdom in their field easily on par with the level of authority I designate to Cheryl Taylor when it comes to Breacher fits.
For instance, here we have a Slicer as flown by Aldy:
And here we have a Slicer as flown by Gah’matar:
As you can see there are functionally very little differences between these two. If I had to choose one I would probably go with Gah’matar as I am a Nanofiber enthusiast. If you’re going to kite, mobility comes first, firepower second, and survivability third. That’s just me.
Now as for the Executioner, I know for a fact that Gah’matar flies that one a lot because he’s going for the number one spot on the leaderboard for that. His most recent fit for that purpose is: