I have used PP since it was launched here in Australia approx 2 yrs ago now and never once had any problems with removal, in fact from what I see of other systems, it is one of the quickest and easiest systems to remove.
I also carry every color of the PP line and don't find any color worse than others to remove.
By the time I wrap the last finger, I can go back and start removing off the first wrapped finger and the entire process only takes about 10 mins and then I'm ready to start my prep and re-application process.
The best way to remove is by using the foil/wrap method.
You must break the seal of the top coat before wrapping and you must make sure you soak the cotton pad with enough acetone.
If you don't soak it enough then what happens is, it starts to soften the PP but then it also starts to dry out to quick so by the time you are back to finger one, it's all dried up and the PP has gone hard again and this is also why you don't leave it on for any longer than 10 mins cause it will re-harden again.
I have discovered when I have helped other PP users, that many times the problem is the base coat has been applied to thick and also the color and top coats as well, the layers must be thin.
I have never had to file any color off of the natural nail after removal, this pretty much defeats the purpose of the service as we are trying to not cause any damage to the natural nail during this process.
I would suggest trying to use a bit more acetone on your cotton swabs, making sure the finger is wrapped tight with good quality foil, do not leave the wrap on for any more than 10 mins but check the first nail after 8.
You might find that it has not completely lifted off the nail (although most times it does) and you have to gently push off the remainder product with a wood stick but you should not have to use a file at all to remove.
Only work on one finger at a time, don't unwrap all the fingers and then start working on them, just do one at a time and work on it as soon as you unwrap it and use the cotton pad to give the nail a good wipe off after you have removed all the old PP.
Also make sure the layers are thin, thin, thin
and only cap your base and top coat layers not the color layers.
Cure for the correct time in the correct lamp.
If the system is used exactly how it is suppose to be used there should be no problems but I will say, I have helped many PP users and the ones that have problems are the ones that are usually not following the exact PP process and I find they add or take out a step here or there and this can make all the difference to a good or bad removal/application.
I hope this helps a little
