Hey Mizar21,
I have two snakes, one taxispilota and one pictiventris that have lost the last 3/4 to 1 inch of their tails due to my lack of attention to the detail you describe. I (now) do what ever it takes to get that last bit off as soon as I notice it.
In the past with shredded skins I ASSUMED the shed was complete after I found the eye caps! I was wrong! Now, I mist the snake for a bit at least at the tail, then take a towel or sack, wrap him/her in it and scratch the tail 'til all skin is off. Each time, once I get it started it comes off in mostly one peice.
In one instance, the tail tip came off as I did this but it was only then that I noticed the constriction that had allowed this!
Since our young snakes grow so fast, this will be a potential problem continually. By the way, I also noted that at the constricted point of the tail, only a little ring of skin had remained from a previous shed, not the whole tail portion so we must (my opinion) ensure that our snakes have one peice sheds to confirm completion!
Since at least one of my snakes is in a shed cycle at any given time, I now mist and partially cover the tank to increase humidity throughout the sloughing cycle. Yesterday the big red belly shed. The day before, the pictiventris noted above; skins where pefect!
Michael