I have a 19" Whisper Wash Extreme Duty 4 bar that is my main stay surface cleaner. It came standard with 2502 tips. I run a Water Dragon 8gpm/3500psi Machine. The SC works great, easy to handle, doesn't try to fly on me, and all in all I'm very pleased. The only thing is, I feel like the 2502's might be restricting that water flow just a bit. Would anyone recommend different sizes or are the 2502's really where I need to be? Thanks guys!