RE: 5 Week Training Strategy
TBH, 7 miles is not a big distance and is doable for most fit people in under 45-50min and the vast majority of others in under an hour. so it shouldn't be a big strain on your weights, i also do a three day a week split PL/OL and find doing my cv [quite a lot] pretty easy going. just eat and sleep a bit more and you'll be fine. judging by what you asked i am assuming you haven'tr really run 7 miles before and need tyo work up to it??!
my suggestion is this:
week#4 3days@7miles [will be difficult if never run 7 miles before]
week#5 2days@9miles [will be a challenge but will make the 7 mile race seem easier]
crack on and good luck.