Percents don't always work.. just are a guideline.
If you grip is failing, use chalk first if you arn't already. Also if you have the option make sure the bar you are using has good knurling.
When my girlfirend pulled 315, her best previous pull for reps was only 242lbs x 3, but we concentrating mostly on singles. Deadlifts don't fair well for rep calculators. I once pulled 405lbs x 20 and at the time I was only around a 550lbs puller. Throw that into a rep calculator and you will get closer to 800 which is way off.
As for improving maximal strength at lower %ages for you I think it will work fine. The more advanced you get the more that you typically need higher percents to advance. Don't max out all the time, but don't be afraid of letting you last rep of the set be a total grinder, either.
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