Like you I'm comfortable at the short distances and am training for my first 26.2. I don't experience the problems you asked about so I can't help there. But, looking at your schedule, it seems a bit tight. Twelve miles to twenty in eight weeks seems doable, but ...
Anywho, what I did was research all the "intermediate" training programs I could find and averaged 'em. I ignored intervals, speed work, and such and focused only on mileage. I came up with a 16-week program that gives me two 21-mile long runs and a couple of weeks taper. Having two of those long runs gives me a two week buffer in case I miss a goal along the way. Which brings up an important point.
As I said, I'm a 10k kinda guy and, like you, I'm comfortable at 10-12 miles, but I found 15 miles a LOT different than 12. Going from 9 to 12 was a piece of cake. Going from 12 to 15 took three tries.
So getting back to my original observation that your time frame looks a bit tight, keep in mind you may not make your goals and if you try to "make up" for it, you're risking injury. Been there, done that!
Me? I'd shoot for January.
Just my dos centavos.
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