malmo,
My examples of the higher mileage week were only suppossed to be a guide, not a rigid schedule.
Listening to your body when trying volume you haven't done before worked for me at lower volumes, it's going to be no different at higher volumes as you have just pointed out.
I agree about not over analysing, it took me a while to finally start doubles some months ago after thinking about it for a while.
When I started, the mornings were around 3-5 miles. Listened to my body by taking days off, running faster when feeling good during and at the end of runs and cutting runs shorter than planned whenever I felt I needed it. Went through some fatigue and soreness but after a few weeks I felt better. Almost immediately my interval sessions got better and it made a big difference to my race times.
I even did some interval sessions a bit slower than usual but they were much more comfortable as I got fitter.
I probably should of been a bit more specific in the post.
I appreciate your help. I sincerely mean it, thank you