You aint gotta let it warm up a minute. Just let it run enough until it fully builds pressure before going off. In 20-30f weather it can take up to 10 seconds for my oil pressure needle to stop climbing and that's with 15w-40 that's over twice as thick as 5w-20 in the kv40 viscosity. About 5 seconds of run time is enough. 10 if you want to be extra safe but beyond that letting an engine idle for a minute on 5w-20 is only necessary when it's below -5f really. But i do slowly drive away too and wait until the temp needle goes up before being more aggressive.
Also why do you use motorcraft syn blend. Do you get it really cheap like $16 or less a jug or do you get them at the dealer. As that jug is $22 at walmart and a huge rip off when a full syn oil like quaker state full syn, supertech full syn, and pennzoil full syn is $19-20 and better for longer intervals. I'd also bump to 5/10w-30 as well since that engine aint new and aint warrantied anymore either.