Yep, so air tight not even 1/2 tonne of pressure will seat those frets.
I have that saw, i have stew mac frets, and i have a 1/2 tonne arbor press for fretting. Even if i adjust the truss rod so the neck blank is VERY back bowed, the frets STILL do not seat.
Even if you did manage to force them into the undersized fret slot, your neck will back bow beyond the limit of adjustment within your truss rod.
Forget it, buy the correct tool. Or, buy your boards pre-cut.
You can readjust the set of the japanese saws, but i wouldnt bother, and i have the correct tools to do it. It is soooo fiddly, its a joke (yes i have done it).