So the fall foundation plan is not about building fitness or ramping up your CTL. It is about putting in a foundation for the whole season. Really just to begin putting in some muscle tension work that will prepare your leg muscles for the resistance training phase. Also you will not really be building up CTL during the resistance training phrase as that is about building strength.
Once you get to the sweet spot training phase that is when we want to see the true CTL build. That is when we are building the aerobic engine and see a steady increase.
You can not build CTL all year long. It will only go so high and then you will plateau and trying to hold that plateau can lead to fatigue, burn out and etc. You want to hit this peak CTL much closer to your A race which isn’t to the middle of the summer. So in the meantime we work on maintenance, limiters, strength training and etc.
Also looks like you are continuing with some good training so your starting point of your CTL is already at a pretty decent point. You are not starting from 0.