No I would have kept the miles high as I could handle, but by time instead of miles. It’s best described as a Milo theory. According to the weight lifting myth Milo was given a calf upon its birth. At that time it had a weight of about 50 kilo. Every day he picked it up and carried it to the barn. Because he did this every day he never noticed that it had gained weight. By the end it gained to about four times it’s start weight to 200 kilo. I would have applied the same to running by time. So if you are running comfortable for 60 minutes a day as your condition improves from 9:00 mile pace to 8:00 to 7:00 you are covering more distance with the same effort. This is it in simplicity. I would have personally had added some pace work which I never did, but I did race quite often. To add to this there was a man who came up with his “collapse theory” . Here it was stated that you needed to run 1/3 of your race distance so that would be about 9 miles a day and that would be 63 miles- can’t get any closer to the Noakes 62.2 miles/100 km. His name was Ken (I can’t think of his last name). I’m sure HRE or others will know his last name.