Wow!
I was having trouble with my old Redline 460cc Adams driver - got to a point where I sprayed it left or right, depending on which one I was trying to correct for. I could only hit it straight if I concsiously slowed my swing down to what felt like a crawl. I had my swingspeed measured and dicsovered that I was swinging at 105mph on the low side, 115 on the high side, so I needed a stiffer shaft.
I tried out the Insight BTY4350 with a stiff ProLaunch Red shaft. Wow, what a difference. I've only used it