I just can't hit zone 2. I'm a HM training program. Ran 7km today, easy run at 5.30/km as prescribed. Very little effort. I would have expected a different  breakdown. Don't want to obsess over hitting zone 2, but either A) my Garmin is not accurate, B) my baseline BPM is significantly higher and should keep an eye out

Checking back on the day's I've been on track doing speed work, my Max HR is 171 bpm. Will try out the test you suggest and compare. Thanks Alberto!

What is you max HR? Try this test:

Warmup:

10-15min slow
3X (1min progressive to max + 2min slow)
5min very slow 
5min fast
5min rest

Test:

3min as fast as you can, you have to finish wasted 

Get the max HR measured during the test

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Thanks. No chest strap. Just got one. Will compare vs. prior reads to see if that was the issue

Do you use a chest strap? OHRM on wrist is usually delayed and not so precise

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Yes, I'm thinking somewhere along those lines too. If my Max HR is 171 and spending that much time at 150-167, it makes little sense that my Zone 2 baseline is right. Thanks!

Your max HR setting in the app is probably too low given how much time you’re spending at 150-167.

Probably still too fast.
I run usually 6-7/km for my z2 runs.

Gotcha, makes sense. What's your Max HR so I can get a better sense?