I would concur, but monitor your flights regularly. My parents are headed ATL-LAX tomorrow and today at check-in 18D/E were gone and they were both sent to middle seats in the 40s. A day earlier 18 D/E were still assigned. That said, it is very unlikely the JFK-LAX/SFO 752s would get swapped (except perhaps to a 767 BE).

One other note on 19 B/C: these will most likely be EC seats, but increased recline would be the only added benefit (but if you're red-eying back to JFK, it might be worth switching sides).