Back off sets and Programming @8 or @9

[sarms209]

I noticed with back off sets you like to program an @8 or @9 for after the heavy single. Is their a reason for this over just going straight into the % based back offs? I’m assuming the average intensity changes but what other factor come into play?

Thank you.

[Jordan Feigenbaum]

We program singles to train the specific characteristics needed to get better at singles. Plus, they serve as a good way to ballpark performance potential for the day.

[sarms209]

Yes I understand the single but for example after that is usually a 5 reps @9 or 4 reps @9 etc.. then %based back off work. So what would be the point in doing 5 reps @9 followed by 78% of e1rm. Rather than just jumping into the % based back offs? 
For example
the bridge:
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78% of e1rm
vs 
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78% e1rm. 
Thank you.

[Jordan Feigenbaum]

I think you can get a better prediction of performance potential when there are multiple "tests", especially when singles are a new addition. The 4 @ 9 set (in this example) is also useful for driving low velocity strength performance, right?

There are pros and cons to both approaches, of course.

[sarms209]

Thanks you.