Keep doing what you're doing man, the others are right. You're close enough as is, no point in changing a lot. If you're aware of any weaknesses in biomechanics, turnover, core strength, weight?, etc, then focus on fixing those.
In terms of base, no more than 10 miles more than your previous successful base phase. Consistency is king, that's all I can say.
Perhaps you could extend the duration of your long run? No specific benefit this has but it is a quality method to increase your mileage a little. Another method (and probably better overall) would be to incorporate a few doubles if you aren't doing them already.
I would say you're weaker on the endurance side, because 9:24 definitely doesn't line up with a 4:14 in my opinion, but that was during cross country. Further, I would think that someone capable of running a 4:14 would run much faster than 1:55
Perhaps a hill sprint progression in the base phase would be useful. Longer hill reps with medium recovery, and throughout the season make the hills shorter and faster, with more recovery. It'll develop a lot of power that will help develop speed.