We made it a policy that if you put something in backstock, you have to update sfq and capacity. Otherwise it doesn't matter anyways.
That's kind of how I do it. I try to check when I am setting.
And if I have backstock, I try to check before back stocking.
Some of my endcap SFQs are way off. Home locations are usually only off by less than 3, but even some of those say 100 fit, when 36 is more realistic.