My take is that maybe the cap doesn't allow to dial it in correctly. If you want to file it down some so you can get a more shallow angle with the razor go right ahead. With injectors my experience is that at some point going too steep doesn't make them perform any better and just makes them overly aggressive. That razor may be outside it's sweet spot because of the cap. Filing it more flat will allow you to find that sweet spot if it is outside the range of it right now because the cap angle. If you decide you don't want to modify the cap I'd suggest sending back to me first and I'll modify it and then send it back out.