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I'm having a similar issue. It's a ***** to start when the oil in the low 50's or below. Starts fine otherwise. I'll even leave key on/engine off for a couple minutes before I try, and it still hates me. I'm running 15W40 still, though I've heard 5W40 is a better winter oil. You say it's a summer and winter problem for you, but that means nothing, as you could be in Canada for all I know. Oil temperature plays a pretty big role I've learned. My truck runs like a champ other than that first start if it's been unplugged.
If it's plugged in, she always starts quick and easy, as the oil is between 88 and 110*. Even after she fires up cold, she idles rough for close to a minute before smoothing out and acting nice. I haven't ran any tests, as I don't have a good scanner. I assumed GP system, then leaned towards injectors (166K on factory nozzles), now I'm thinking it's just the oil. I'm pushing 310hp, 647tq on PHP dyno with PHP 45hp economy tune, so I know the engine is healthy overall. Heck, I can't hook up on a boosted launch.
The point being, if the oil is cold, it flows for crud, and it needs to flow nice for the HPOP to efficiently run the injectors. I blow enough smoke to make a pot head jealous during a cold start, she just doesn't want to start in a nice manner. It takes a few tries, and even kicks a couple times. Next winter I'll try 5W40, but until then I'm just playing the plug in game. I park at the house over night, so it's not a big issue for me.
2002 F250 CCSB 4x4
PHP Phoenix, John Woods VB, NUC bypass, 6637
"No country can be called free which is governed by an absolute power;
and it matters not whether it be an absolute royal power or an absolute
legislative power, as the consequences will be the same to the people."
--Thomas Paine, Four Letters on Interesting Subjects, 1776