HR on Epix Gen 2

Buy a nylon strap, it just works (even a chinese). Problems solved. 
In any case, 1. and especially 2. are a no brainer; 3. is true for all watches for some people and sports...

My previous Fenix 6pro was much worse, so the millage do varies... 

Upgrade to beta didn’t work. 
I want to wear my smart wrist watch near my wrist and not my forearm. 

I have tried Apple Watch Ultra (gen1) and Fitbit charge. Both of them show correct HR during exercise. 

Mine F6Pro wasn't during 3 years, compared to my recent F7Xss which is actually very less accurate regarding WHR

But 17.10beta seems to be better even without nylon strap

I encountered unexpected drops and spikes with 15.7x and 16.2x.

But 17.10beta seems to be better even without nylon strap.

for me i talk about run or trail activity type.

May be I will try the 17.1 beta 

D7nku said:

I want to wear my smart wrist watch near my wrist and not my forearm. 

The suggested position works out to be about an inch above the wrist bone. How is that your forearm? If the watch is worn close to or on the wrist bone then WHR won’t work as desired. 

May be you are right. But is it too much to  expect a watch worth more than £800 to work straight out of the box. 

The issue with the wristbone is that it can create a gap between the watch and your skin, allowing external light to enter the sensor.

Spending 800 on a watch does not alter basic anatomy. So regardless of the price, wear the watch well away from your wrist bone.

Also, regardless of price, OHR based sensors (regrdless of price or brand) are less responsive to changes in HR than electrical based chest straps. If recording the intensity of anaerobic activity is important to you, use a chest strap. Although as an aside, I have yet to see convincing evidence that HR is a meaningful meaure of strength training such as squats.

D7nku said:

my watch shows that it’s only 46 when it’s actually 156.

Have you also started the corresponding activity profile?