I have purchased my first PCP - a Daystate X2 Sports R. Any ideas on how long it will take for the groups to tighten? I am used to a Theoben Evolution and at the moment the group sizes I am getting with the X2 are HUGE compared to the Evo: 30mm+ at 15m! I assume there is a bedding in period but after approx 70 shots things don't seem to be any better. Any advice would be appreciated.