Instant pace accuracy?

Hi Enduro 2 owners! 

I'm an unhappy 6x Pro Solar user, in that the GPS tracks are awful (which makes it hard or even dangerous to follow a planned route through tough terrain) but also because the instant pace is just absolutely horrible. Running along a straight line with trees on the side will cause the instant pace to fluctuate 2-3min/mile every time I look at the watch. Absolutely useless. 

I know the Enduro 2 has best in class GPS accuracy, but how accurate is the instant pace?

(yes I have a Stryd but it's no use during structured workouts)

Thanks for your input!