That tip is going to pop off. I had problems with some layered(Samsara too) before forum members stepped up and helped me.
FIRST, sand the glue side with 400 on a flat surface. On embossed tips, I use 220 then 400 and take to impression off(that is me, nobody told me to do this. It just works for ME). Wipe surface thoroughly with clean paper towel.
Second, take THIN cyano a put a drop or two on tip. If the tip soaks up all the glue immediately, add a bit more. Take heed not to pile an uneven coat on top the tip.
While that is drying, take some 400 and scuff your freshly faced ferrule just a bit. Some say dab a coat of thin here as well but I never have. Wipe with clean paper towel.
Third, sand glue side of tip again with 400. If you immediately start getting leather, wipe and put another drop down and wait for it to dry.
Repeat....the goal here is to seal the small holes in the leather that act like a sponge(they pull the glue away from the mating surface leaving it adhesion starved...THAT is why you have that sound and why that tip is gonna go away)and give 2 surfaces a chance to properly bond.
Put a bb or 2 worth of gel super glue on tip and center on ferrule. I suppose you could maintain pressure with your fingers long enough for a bond. If you have one of those clamps with triggers that would work, albeit tricky. You want to be able to wipe any excess glue away from ferrule.
The shaping and all looks nice, just beware of heat. That will kill not only the super glue, but the glues they use to bond the tip together. I REALLY like using: some sealer, 600, 800,1000, then some 3m imperial(white)compound
The hole in the end of the ferrule is nothing to worry about it simply allows excess glue to escape when installation is performed and prevents "something" from breaking from hydraulic pressure...