Easiest 12 FPE to cock?

Same here. My 1979 FWB 124D has about an 18lb. cocking weight. My Weihrauch HW30 is about the sane, with way less FPS. 
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My 16J Walther LGV is easier to cock than my stock Walther Terrus- not by much though. I don't know what the muzzle fpe is for either but the Terrus is more.

The breech lock lever and the muzzle handle on the LGV make it far nicer to cock too. I don't have to slap the barrel to break it open like I have to on the Terrus. The Terrus sorta makes my hand sore after awhile from breaking it open; however, all of my breakbarrels make my hand sore with the exception of my LGV. I like my LGV a lot!