I am having trouble making a triple setup work on my Rivendell Sam Hillborne.
I am trying to use a Specialized "Flag" triple crankset and a Deore XT FD and Shimano barend shifters (set on friction.) [ Deore XT FD seems to be the Go To FD choice for Rivendell riders.)

I have I think followed the standard FD setup steps.
- in Small Front/Big Rear set the limit screw to just allow the chain to clear.
- set the FD cages basically parallel to the chain rings
- allow a coin's thickness height clearance of the cages over the big ring.
- while the Specialized "Flag" triple crank is not in Sheldon Brown's database of compatible Cranksets and BB I think I used a 117mm axle BB and the small ring seems to just be clearing the chainstay reasonably.

But I cannot seem to get enough "throw" to both shift into the big chainring AND to drop down into the small ring.

Now, maybe just dipping into my parts bin for parts I think should work has left me again with incompatible components.
But I understood that a LH barend shifter should have enough range to cover a triple shift.