pccp If you need to lower the FD more than the adjustment allows, you can use
THIS from Wickwerks. it is already too high for the chainring you have, so I dont thing there is enough adjustment avaialble for a smaller large cahin ring.
I had no problems using a 48/38/28 on my DuraAce 7400 rear deraileur. the front shifting was hard and iffy , especially shifting into the inner or outer chainring. Do-able, but not anywhere near smooth...This required a new BB (too long, but I didnt have time to dial in the chain line), new TA chain rings with a tripleizer 38, and a new chain for the length needed. of course the crossover gears are more problematic than usual, but you should be avoiding those already! all together this cost me over $100, but under $200 I think. BB was cheap, but TA rings were pricey.
this took a new BB