I am trying to add front derailleurs to my 2 folding Downtube bikes, pictures attached. The problem is the seat tube angle means that they have to be set further back than normal in relation to the large chainring. I have clamps that fit and the necessary clearance for the 2 chainrings (22 & 42). I only need the largest 3 or 4 cogs with the 22 t chainring. Will it be a no go if the derailleur sets a bit behind the highpoint of the large Chainring? as long as I leave enough clearance? I considered using the forward tube on the mini but that set the cage too high to clear chain on small ring.