Understanding Z follows setting

Hello everyone, I have been getting failures within the base of my supports using the FEP vat. Everything was printing great until recently the supports near the hinge fail part way through the base (within the first 10 layers).

I tried decreasing the PM initial speed and increasing the PM reset position with no improvement. I found some very confusing and contradictory information about the z-follows setting and would like some clarity.

What is the possible range of the value, and what does a change to the value mean? the default is 2, what does that represent? Does it always happen or is it disabled for the first n layers?

Thanks!

do you have pictures? and can you share some settings.