Adding to Syrus’s good observations, keep in mind that until you’re running a bit faster, it is unlikely you will tax your CNS too much, especially at the lower volumes you’re using. However if you feel the need for a brief deload, simply drop your volume by about half, maintaining intensity on each rep. One other thing; while you’re working on work capacity and general fitness, the longer hills are great. But I think you’re probably not doing them all at 100%. To really work on improving acceleration, include some shorter work on the hills, 20-30m, that you do at 100%.
In terms of progressions, for what you’re doing you can simply increase volume over time, then as your fitness and speed improve, begin reducing volume (# of reps) as you lengthen your accel distances out to 60m. Generally speaking, your sprint volume can run between 240m and 360m per session, depending on the level of intensity (highest intensity sessions should be of slightly lower volume, lower intensity fitness sessions can be slightly higher).