I'd also use flat body washers between the blade plate and blade instead of spring washers as spring washers won't support the blade as well ( the spring washer has less surface area supporting the blade plate so any impact of the blade and it may bend the blade plate easier than having the bigger surface area of the flat body washers supporting the blade)
Another quick check would be to place a flat piece of wood under both blades to see if they are flat to the wood as a lot of blades can get a little bent , 2 pics below showing one Honda blade plate with two blades bent up quarter of an inch and one pic of a Honda blade plate with a straight flat blade.
If blade are bent just bend them straight with a big shifter on the end of the blade.
