If the purpose of your sale is to move slower selling merchandise please group the products for me by the percent off. If you are advertising up to 60% off but 95% of the items are 20% off that’s not respectful of my time. I refuse to view these sales.
Would be better to have a link to each percentage point off collection.
Another alternative is to run one sale at a time. But you might say that the 60% off collection has only 10 items in it , and it probably isn’t worth emailing your list, right? If that’s true then it’s not worth alienating your customers, either.