Question for you HR zone experts - warning, long winded.

I have been training for 12 years with a HRM and I am very familiar with my HR, my body, and performance during training and racing - so I don't plan to change much BUT I sometimes get a nagging feeling that I train just a little too hard. I want to do a lot of base training this winter so I want to start planning for it.

I know to get true zones, I should get an AT test or VO2 max test (so you don't need to tell me that). BUT, based on the following - what should my zones be?

My data:

In general, I can maintain a HR around 173 (took a lot of research and experience to come to this "magic" number for me) for an extended amount of time (around 1 hr) - This is what I usually try to keep it at for a 10k race and what I use for my AT. Any more than 173 and I start to feel that I need to pull back some and the lactic acid build up.

I can go up to 185 for up to 10 to 15 minutes (as if I'm trying to sprint at the end of a 10k or climb a big hill on the bike or 5k race) Anything over 188, I know I can't maintain for much more than a couple minutes (red zone).

Around 135 and I can go forever, breath easy, hold a conversation - easy workout and what I use for a recovery workout.

Around 145 and I can still go forever but I start to get a little winded and it starts a sweat. (my aerobic base training does not exceed this number)

A lot of my long bikes and runs I like to keep in the 140's but end up creeping into the 150's by the end.

Into the 160's and I start to feel like I'm pushing it - use for some fartlek/speed training.

MHR - as tested was 201
RHR - about 45
Age 38

Something I have noticed about myself compared to research and other athletes - I seem to be able to run/bike at a slightly higher HR than most people and feel pretty comfortable.