When I first started using Platine I got a speckly look.
The SIMPLE solution for me was to add 2 drops ilfotol (ilford's photo flo) to my emulsion. This is for 8x10. This is when I coat with a glass rod.
Also, I make many passes with the glass rod, perhaps 10 or so. Platine does not abraid very easily... unless you use a lot of pressure.