Generally, EOS switches want to be further away.
On older pins, the longer the “stroke” the more 50v power you get. The EOS turns off the 50v and starts the 12v holding power. So you want the EOS to open a MM or so right at the end of stroke. (Hence “end of stroke switch”).
However, on modern machines like SAM (and I’d be pretty sure SPIKE is the same) the EOS performs a different job.
The flipper is fired by 50v a set period of milliseconds and then changes to 12v hold.
The EOS is used so if the flipper button is still held in, and a ball hits the flipper and the flipper falls down and opens the EOS, the 50v fires again to hold it up. So your EOS wants to be adjusted correctly at the end of the stroke, so that the flipper doesn’t fall too much and “double flips”. The extra 50v fire should be pretty much not noticeable. If your EOS switch was broken or there was a wiring problem, a ball landing hard on the flipper would push it back down as the 12v wouldn’t be enough to hold it up. You could test this with your finger - hold the flipper up and push down with your finger. The flipper should resist.
I know GOTG has had problems with flippers dying due to software issues. Hilton’s machine has been playing up. I haven’t heard of it on AS but maybe there is a software issue.