I am fairly new to running myself (three years just gone) and understand your enthusiasm and ambition. However, you need to be patient and understand that your development as a runner is a long term process which cannot be hurried by hitting arbitrary mileage numbers.
In my opinion, if you are training at a volume that is already demanding, then you should stick at that. Following principles of adaptation to training stress, over time your body will begin to find your current volume easier and it is only then that you should consider bumping your mileage. Runners are only cheating themselves out of aerobic improvement during base periods if they train at a volume below their ability. There is not a magic number to hit where you will become a world-beater - no matter how tempting that thinking might be!
From my own experience, at the beginning of this past summer, I aimed to hit 60 mpw and this felt ambitious (I was coming back from an ankle injury too). By the end of the summer, this volume felt much more manageable and I was able to bump things up to 70-75 mpw in September. I am still in a base training phase right now and have set new personal bests over 10M, HM and 10K in the past 8 weeks. Now of course, 60 mpw is a 'down week' that I can take in my stride.
What kind of feedback have you been getting from your racing and training since you upped your mileage to 70 mpw? You may already be improving.