loco,
Umm... stroke rate and effort aren't really correlated in the way you think. I literally posted about this before. There is certainly a tradeoff, but just saying "dropping your stroke rate will lower your heart rate and time" would not be accurate.
https://www.sas.com/content/dam/SAS/...eid=e650405f24
This may help clue you in since they exclude SPM for novices due to a variety of body types/technique issues present with novice rowers that virtually don't exist at high levels where everyone is about the same level of mongo tall and has literally world class technique!
Monte,
Sure, would agree with all that. Generally undershooting your intensity on longer rows is better than overshooting. Overtraining is a real thing especially when just starting out on a whatever program.