New York (YONKERS) Steam plumber recommendation?

Hi all.

After a lot of threads and PMs I have identified the most probably cause for my imbalanced system issue. I need to either drill and tap an angled main vent into a vertical return, or pipe in a sideways T for a straight vent. I know neither are ideal (not far enough back from return, water hammer potential etc), just the way my system is and what needs to happen.

I've had several plumbers come, but none of them really knew steam systems. On one hand I could tell them exactly what I want done, but i'd rather somebody that knew why I wanted it done and maybe consider other factors that i'm not.

Any reputable steam plumbers in/around Yonkers or the Bronx?