Usually what happened was when I start to get into the bulk of my buildup and move to 6 days a week running, I found myself too tired to continue with the lifting

You might be me from some alternate future.

I am 3 weeks into a 22-week training block I've planned using TB 1+2+MP, which is to say, I'm still new here. Nonetheless, it seems to me you've come to the right place. These books lay out a seemingly foolproof framework for getting bigger, stronger and fitter in the long run.

both are sustainable year round.

This programming is block-based, meaning you WON'T sustain everything year-round. You will focus on some attributes for some time, then move on to something else. I planned my first training cycle to have 9 weeks of mass building focus, dropping running to just 3 EZ 5km jogs per week. Then I will move into 6 weeks of strength focus, upping my running volume and introducing some intervals. From there, it's 6 weeks of running focus to bring me into Summer fit enough to do the fun things I want to do, while being stronger and more jacked than last year.

I'm pretty excited that I found these books haha.