North can be started at 54 (C2) with little difficulty. Mobs are all charmable with CW (bar the bosses).
I'm not saying at 54 you need to rush in head first and pet pull bunches of 10 mobs at once, but carefully working your way around the safe spot ramp (making for easy CR) and maybe pulling the first room's boss is relatively involving and safe, plus you have a shot at a 4k pp Ada club.
At 58, get a cleric partner and do West until 60.
I don't recommend doing entrance at all, as an enc. North isn't harder than entrance, in fact, it's easier, because you have a safe spot, which you don't have at the entrance. In North you don't have people zoning in and messing with your mobs, you don't get the East roamer, you don't get HTing repops on your ass, and you get a shot at loot.
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