Emmy - I did 20 miles last Sunday and I was absolutely knackered at the end. The fact that you can do this week after week shows that you have superb stamina.
I've got another 20 on Sunday then a half the week after, then it's tapir time.
During those last 3 weeks my body will start repairing and my energy levels will come up and I will be ready to go.
The energy you are feeling at the moment is because of the little respite that you have given your body and it seems to be doing you really well.
For your plan, give the 6m at MP a go and see how you get on. I've never had much success at changing pace mid run, unless its to do a 'sprint' section but its definitely worth a try.
Have you tried a shorter run at MP, like 3 miles with a 1 mile wu/cd? DV suggests this kind of thing for getting used to how the pace feels.
Pace Bands. I always print my own out and cover them in Sellotape, then I loop them around my wrist and tape them shut. It's often difficult to get them off at the end. I have all sorts of info on mine. Mile pace, Km pace. Gel distances. Even, the places I will bee seeing Mrs O
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