I will be purchasing a custom MB/CB combo set but first need to select my steel shaft. I use a 73X Whiteboard so my swing speed is sufficient (110-ish) but I am unsure what iron shafts will lower my ball flight significantly because right now I am ballooning my 695's with stock S300's. I was thinking S400 or Project X 6.0, but what's the experts advice? Thank You-