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@Dangeruss
ok so even with 2.5mm of extra width on the driveside (123mm BB equiv) it still doesn't shift properly,
the pressed ramp on the derailleur which narrows it by 3mm and eases the chain across basically stops before it curves round to the same level as the chain when on the middle ring.
Looking at the difference between double and triple FDs the significant obvious difference is the length of this ramp....
mine (double)
http://cdn.bicyclehero.com/catalog/product/cache/17/image/650x/040ec09b1e35df139433887a97daa66f/s/h/shimano_tiagra_fd-4500-b_front_derailleur_bandon.jpg
Triple:
http://i.ebayimg.com/00/s/NjE3WDYxMA==/z/xvcAAOxy4t1ShVa8/$_12.JPG