Venu 3 dimming

When I start a Row activity on Venu 3,  and row with watch attached to the rigger in front of me, the screen dims after a short time and the screen is too dim to read.  I have Battery Saver turned off, Brightness set on High, and Always On selected.  Hard to believe this dimming/battery saving feature can't be turned off.   Is anyone aware of a work around?  The main reason i purchased the watch was so i could monitor pace, distance, HR, and stroke rate while rowing.  Frustrating.