Originally Posted by kazamzaa
What I mean is that with co focus the stringbed becomes springy and difficult to control the ball after hitting two or three hours.
Not in my experience. But as in everything else, people's mileage may vary.
5 x Head MGPMs: Pacific Classic Gut 1.25 x MSV Co-Focus 1.18
3 x Head i.PMs: OGSM 1.22 x CoF 1.18, Energetic 1.20 x CoF & PPA 1.25 x CoF