How the heck can I keep from making my fret slots too wide!

[Luke Single]

I am honing my Refret skills and one issue that i continue to see myself having to overcome is getting a perfect sized fret slot. 

STRICTLY SPEAKING REFRETs

I understand there maybe be difficult jobs that don't follow any rules and you have to adapt and overcome. I need advice on a standard job. 

The most direct question I have is how do you clean the slot out without making it too wide? I repeatedly make the slots slightly too wide and the fret end will not seat well without making the fret tang wider with fret expanders. Its not that I make it ridiculously wide its just say .023 instead of .020. It is only sometimes not all the time. If it is .020 the fret seats perfectly if its its .023 its loose, at least on the ends. At least that is what I think the problem is. 

I know some of the tricks to overcome loose slots such as refilling them with dust and glue, using fret tang expanders, hitting the fret side ways, gluing them in. Usually I just need to glue them down or crimp the fret. 

Is this issue status quo and you guys just use one of the above methods to address it?

To clean the slots I use .020 fret saw from SM the one that has two little blade on either end, one that is push and one that is pull. I use the standard SM claw hook thing to remove dust, I take my time and move slowly being sure not to rock the saw. I just feel like a .020 without making it .003 wider sometimes is just impossible. its too small of a variance. 

I have tried using the .015 saw but that isn't wide enough!

What am I doing wrong?!  

Bonus question when snipping the ends with flat face end nippers SOMETIMES the fret gets pushed up a little and has to be pushed back down, is that normal?

The tools I use are

Hammer

fret claw press

http://www.stewmac.com/Luthier_Tools/Tools_by_Job/Tools_for_Frettin...

http://www.stewmac.com/Luthier_Tools/Tools_by_Job/Tools_for_Frettin...

3 corner file for beveling the slot

[Roger Häggström]

With the Stewmac tool "fret barber" you can shape the thickness of the tang to the thickness of the saw or slot.