Charlie’s Phase 1 is the highest volume of his program and he wrote many times that the volume goes down as you progress from acceleration toward SE. See the Vancouver or Edmonton pdfs and the volume numbers (over 2000m of speed/wk in the early parts of Phase 1). Remember that CF had Ben doing 200s (some claim that Ben cut these to 150, but the point is the same) and CF wrote that his people ran 100’s fast in Phase II right out of the gate.
The catch is that while you’ve been running your CNS into the ground, you’ve also been getting in hardly any volume. I imagine that you are limited by the need to maintain good political relations with your coach, but I think you need to build up some volume to taper off of-- if not 3X4X60, then at least some decent tempo volume.
As Charlie said, look at your key races in the season and work backward. Think about what you want to do in Phase II (and phase III if you have one) and what you need to do NOW to transition.