reverse application and inverted application are 2 totally different things....If you put the word inverted into the search facility on here you will see several previous threads on this subject. Why do you say dodgy?
Here is just one thread:
On the website im sure it says that the plastic tip is as thin as a human hair so i would imagine filing through it to rebalance wouldnt be a problem.i still cant understand how its possible to infill/rebalance them when the acrylic is under a plastic full nail tip right up to the eponychium??? Is it just me being thick(I no im out of touch with nails as not practised for nearly 2 yrs due to my allergy :cry but, you would have to drill threw the plastic to get to the acrylic, then at the infill, there would be a prominent line(the acrylic and nail tip on top) if you added acrylic over that it would not look right???