See you are having some issues with the paper becoming a bit flimsy, what i and i know quite a few other stencil artists use is a Manilla Card/Stencil Board (can be called other stuff) can get it from Handover or Jacksons in 30x20" sheets i have info on the manufacturer but they have minimums in excess of 500 sheets but Handover & Jacksons are well priced but if you want to know manufacturer feel free to message me bud. Get a A3 printer plenty about print as poster and join together then spray adhesive onto the Manilla (grey board can work as well) and cut through both layers together, the manilla card is coated in linseed oil so paint doesn't seep into it and can be re-used time and again.
Next up, Diamond Dust a.k.a (German) Glitter Glass it's actually the same thing. Just depends on what grain you get (Grit) Meyer import from a factory in Germany the same Factory the printers in the U.K get their product from i actually got their sample booklet through couple days ago shows you the different grit sizes and colours they supply as standard but can make your own to order again, if interested just shoot me across a message. Could be good to set up a thread for materials if other people on here are interested? With the application of the Diamond Dust, PVA is the way to go.
Nice work and keep up the precision stencilling buddy!
edit: Added whats your cutting tool of choice ?
I can't recommend OLFA or Swann Morton highly enough!