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If your wrist strap is that far out I'd say that makes it pretty useless and going by breathing rate or just perceived rate of exertion would probably be more accurate than that. What one are you using? I'm looking into some of the arm based straps at the moment as i find the chest straps get uncomfortable when i get very sweaty.
Just to pipe in on the HR chat. Wrist based HR often had my max a good 10-15 bpm above what the chest strap says. Either that or my heart ain't the same since I started using the strap (but the consensus is that wrist based HR gets pretty iffy at the top).