Tom Ray, I'm just wondering how you came to the conclusion that it was Cuban interference and not the 710 in Miami?
I don't speak Spanish so I wouldn't be able to differentiate between one and the other unless the Radio Reloj time tones were present.
It wouldn't surprise me in the least if part of the government's brokered time on 710 had an encouragement to "accidentially" forget to switch to night pattern/power. :
As much DXing as I've done and as much (or little) as I know about radio, it still fascinates me that a station in Cuba can do so much destruction in Jersey but here in rural Mississippi it's barely audible. (I hear Spanish but not enought to get a good lock on what it sounds like.)