Shaft length very much effects lie angle. The longer the club the flatter you need the club. The shorter the more upright. If it was me and I was ordering forged clubs I'd order the length I wanted then hit every club off a lie board...
Are you talking something like a Titleist CB cavity back or more a game improvement iron? I'd say if you're talking Titleist CB then no. If you're talking game improvement irons then yes I do believe they have the potential to go further.
I think you just have to find a putter that works best for you. In my opinion though a good putter can make the ball go in the hole using a broom. A good putter (person) is a good putter.