i throw a hard 4 seamer but my 2 seam isnt really moving much more than my 4
i also throw a splitter and a circle CU and slider
would it be a good idea to mix in a 2 seamer once in while just to give it the appearance of a different pitch than my 4 seamer? just to throw the batter off a little?

lose the 2 seamer and just use the splitter as ur other fastball