Im going to pull the trigger on a used 917D3. I was fitted at my local club for an 8.5 loft with the Fujikara Speeder TS74. I hit both the stiff and xstiff pretty well, numbers were similar. My swing speed is 105. My fitter said I could go either way. Any pros/cons of going stiffer with the xflex or staying more flexible with the stiff?