There are a couple of other issues that could come into play here. If the two stations are already short-spaced and have been grandfathered in at their current locations, there could be a chance for WFME to move. This seems plausible as West Orange and Springfield, MA are roughly 125 miles apart. The FCC allows already short-spaced allotments an opportunity to move so long as the move doesn't exacerbate the problem. However, I believe the FCC regards "exacerbating the problem" as moving your transmitter closer to the other short-spaced station's transmitter. In other words, you can move a transmitter within the forbidden zone, but it has to be an equal or greater distance from the other transmitter. This would still rule out a move of WFME to pretty much anywhere in New York.
The rule governing grandfathered short-spaced stations is 73.213. WFME would be allowed to move closer to WMAS-FM if it can be shown that total area and population in the interference zones of each station are not increased. Since both stations are commercial Class B, predicted interference would occur where the 34 dBu interfering contour of one station overlaps the 54 dBu service contour of the other. I have software to do these studies, so I just checked the situation.
Here's where it gets interesting. WFME could indeed move to Empire and operate with full power from the master antenna without causing
any additional interference to WMAS --- however, WFME's new 54 dBu contour would receive
considerably more overlap from the 34 dBu of WMAS. To keep the total area of received interference the same in compliance with 73.213, WFME would need to reduce power by about 6 dB. In other words, if the nondirectional master antenna is used, the allowable ERP would be 1.5 kW, rather than the full 6 kW. Overlap would decrease towards Westchester County, but it pops out on Long Island.
Now for a lesson in FCC Physics: If WFME were considered a Class C2 commercial facility (or even Class B non-commercial), none of this would matter because WFME's protected contour would be defined as 60 dBu, the WMAS interfering contour would become the 40 dBu, and they would clear. WFME could then run 6 kW at Empire and serve far more population, but the FCC wouldn't consider this "in the public interest".
Does this make any sense?