For what it's worth, having both the Heat Stroke and Hook Pearl (orange/purple) drilled the same at 5"x5", I had to hit them both with 4k to smooth them out more. The Hook Pearl was quite flippy and with the surface change it smoothed it out big time. With the Heat Stroke I found it to have an early read, but the motion wasn't floppy, but a strong arch. The surface change pushes it further down the lane, but it still retains its strong arch motion. I would say if you want more of a arch motion with strong continuation then go Heat Stroke. However if you are looking for more backend pop, then go Hook Pearl. Also the Hook Hybrid is equally as good. Either one is sure to not disappoint. At that price point you won't be disappointed. If you have any questions let me know.