Sahasastar,

I don't want to pretend to be some sort of authority on this, but:

Lower down on that page are confidence limits.

Currently they are 2.5% at each end.

So you have a 1 in 40 chance your strike rate will fall below 15.62%.

You may be justified in tuning those parameters to something higher, to stop hanging around forever.

There's nothing that wrong in starting with A, B, C, D, E then sacking any non-performing ones along the way, as that is a logical way of reducing your stakes in bad trots.