training for track in the spring

Keep the mileage in the range. Are you doing strides? Strides often will definitely help with your form and keep you quick. Maybe once or twice a week when doing strides really open up to doing a few full sprints (whether that's 50-75 meter sprints, 150s where you stride/sprint/stride for each 50, or anything similar.

Rep workouts a la Jack Daniels could help once a week (200s-400s with an equal distance jog rest totaling about 2-3 miles. Start at your mile working down to your 800 pace). Also, a weekly tempo or threshold run would be great to incorporate to build strength.

As for track workouts, during the last 4-6 weeks before your peak, doing hard 300s-800s at mile pace or faster with shorter rest, or 200s-600s at 800 pace or faster, will definitely help you get used to the pace. I would avoid doing these often however if you are doing a lot of races in that time period.

Also, maybe in the 12-6 weeks before your peak races, running some 3ks/5ks, or some 400s will help with your speed and strength. A standard v02 max workout every 1-2 weeks (600s-1600s totaling about 6-7k with 2-4 min rest) could take the place of these workouts if you choose not to race the 3k/5k.

Although I said keep the mileage in the range you are doing already, raising to around 70 for a few weeks before bringing it down in April should help as well.

Now is the time to incorporate hills into your workouts. Uphill sprints, downhill strides, sustained gradual incline tempos.

Try to get into some open XC meets if you can. There's nothing like XC to give you a reality check, even if your spring focus is the middle distances.