Another symptom is chainrub on the middle chainring when on the small. I did a couple conversions and pushing the crank farther out helped.

I did a triple conversion on an early 80s Trek 700 with a early shimano 600 double with a triplizer and found the 127.7 was too wide and a 124 worked better.

My experience with triples is to have a variety of spindles to work on the fit. I picked them up at various swap meets, and some are bad, but thats ok for fitting up the triple.