I see what your problem with the hinge pin being too short is. The extra bit of aluminium on the right hand side (in the pic) shouldn't be there. The arm should be in contact with the e-clip, that bit of aluminium means the hinge pin (presumrably supermaxx ones) which are designed for the stock bulks, are not long enough. There is no problem with having the extra bit of aluminium (it probably adds strength - but FLM should have added the right length hinge pin.
From my past experiences with FLM, they're products are very cheap, nicely made, but SEVERELY lacking in the quality control area. If only they could sort this out, I would be much happier to use them...
PS. This pic is the bulkless system, you can see the same problem
http://www.fastlanemachine.com/ComboBulksFLM17500.htm