re: Why is my HR so high on easy runs?

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That's part of heart rate training. You need to shorten your stride. Focus on 90 foot strikes per minute. It is hard to maintain at first, but you get used to it. Lessens the impact on the knees.

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I'm assuming you mean 90 strikes per foot, for a 180/min stride rate. I'm around 170 as it is and I'm pretty sure I'm not overstriding.

@BRM, I'm 27, so MAF would give me a HR of 153 for my easy runs if I'm reading this correctly. That sounds pretty reasonable, as I think I can hold a sub-10 minute mile pace while staying at that.

Again, I'm only 4 weeks in to base training and I've already felt a little bit of fitness come back. That is, I feel good enough that I could go faster than the 9 minute pace I started at 4 weeks ago (I could, but I don't). Like you say, for 15mpw I probably don't "need" HR, and probably won't get injured doing what I've been doing before my fitness catches up. I was just interested in what the "right" way to do it was