Luck and Silky are mutually exclusive...either/or, not both. I thought you wanted Silky on that Scythe?Why? Because yes, I have Luck and Looting on scythe.
What gear do you recommend for city raiding? I have jetpack and glider, pneumohelmet, invar boots and leggins. Should I switch to diamond or something? I have enough diamonds to make full set.
I'm in 3/4 Diamond and I'm still getting raped constantly. Diamond helps keep you cool [important around Blaze!]. Pigmen are my bane ATM. And I tried disabling Vampires [specialzombiepigmen] but I'm still seeing them [I'm still in 1.1.2].
If you're setup to have sewers collect XP orbs and you add horizontal range upgrade, you're limited to a single sewer for that horizontal range and it slows down the sewer even further. XP orbs accumulate on the ground and can cause random lag until they despawn. And you still need to filter for essence 'cause hostile mobs somehow generate sewage [eww]? This is why I recommend'd multiple sewers with only vertical range upgrade [if needed] if setting up for sewer->essence.upgrades to sewers allow you to use one sewer to cover a large area. as long as you don't kill mobs or breed them in that pen, you won't get any experience to clog up the sewers.
also, if you set the te fluiduct to filter only on sewage, the exp will get trapped in sewers. dunno what happens when that fills tho.
If setting up as a sewage producer, then single sewer with applicable upgrade is the way to go.