Yes. You should be concerned. I don't think that training is really helping you with your goal of getting your relay to your state meet. 25 miles per week with a 8-9 mile long run is basically giving you minimal running the other 6 days a week and while lifting and plyometric work have been shown to benefit distance and mid-distance runners, running has also shown to benefit them.
I am confused about whether or not your goal 4x8 is for the indoor or outdoor season. Assuming it is indoors, there is nothing your can really do at this point in terms of improving aerobic conditioning in time for the state qualifying meet because it is probably in a matter of only a week or two.
However, if you are planning for outdoors there is time to remedy this. I would slowly begin to increase the non-workout day volume. If you are operating at only 25 mpw now, you will see great marginal returns as you increase the volume. I believe if you can get your runners up to 35-40 mpw this will help substantially. The 800 is a mostly aerobic event, so aerobic conditioning is vital. Not the biggest fans of the workouts. Would prefer to see some longer interval work or broken tempos. I do however really like the mile-pace speed endurance work even in base phase. The 4x150 workout I wouldn't even characterize as a workout--it is the equivalent of post-run strides.
This is what I would do:
Monday: 2 miles easy warmup, 5x800-1k at 10k pace w/90"-2 min rest. 1 mile easy cooldown. Lift after
Tuesday: 5 miles easy
Wednesday: 5 miles easy, 6-8x short sprints on hills progressing onto track later in season
Thursday: 2 miles easy warmup, 6x400 @ mile pace, 4x150 @ 800m pace. 1 mile cooldown, lift after
Friday: 5 miles easy
Saturday: 8-9 mile progression long-run. First half easy, third quarter moderate and last quarter progressing down to a pretty good clip. (this is great for mid-distance runners); Lift after
Sunday: off
Total mileage=35 miles per week