Yes, you can get within 10% of your AnT of 185 but it might take a while especially if only have limited training time each week (you didn’t mention your weekly training time). Continuous work, progressive building, and patience will get you there.
If you’re worried about burning out or getting injured you could try a 2:1 build:recovery structure. A “traditional” 3:1 gives 13 recovery weeks per year (assuming you train every single week) but a 2:1 gives 17 recovery weeks, so you get a full month of extra recovery each year.
Slow down your ramp rate (how much time/mileage you add each week), at least of the Z2 mileage. If you want to ramp up faster, make the excess time very easy Z1 or recovery, even if it means brisk walking. Eventually you’ll max out your available training time with the Z1 and recovery and then you can slowly replace it with Z2 if you want.
Make mid-Z2 your max training HR. There’s several mentions on the forum that AeT varies day to day so if your AeT is 150 and you train at 148-150 every day then you might be going over your AeT several days per week if your AeT that day is actually lower due to fatigue or life stress. Maybe shoot for 140 set 145 as you max training HR.
Lastly, on the uphills, don’t be afraid to slow down to a walk. A brisk uphill walk is often easier on your legs than running and you can probably still keep a low Z2 HR.
With all that said, I don’t know what your goals are or what your timeline is for those goals. For my own training I’m taking the long view because I usually have 2 “big” events per year those are trips with friends, not competitions, so I can afford to make slower progress. But seeing that progress while not getting burned out is also pretty motivating.
