when is it better to stay more "behind the ball" or "up the back", and when is it better to come some around the side of the ball?
By studying the midlane ball reaction through out the night you can know when and how to alter your release. However, this question is less relavent today than it was 20 years ago when these small type of adjustments where what separated the big dog from the puppies. Today bowlers grab into there bag and produce a different ball, one that "matches up" with the altering condition.
Although there is no EXACT science (as everyones release, speed, preferences are different)there are some principals. But after looking around for a day for articles relating to this specific topic I could not find any, at least that were concise and specific. So I will take a stab at this for the group to hack at.
In general here are some rules:
1. Staying behind the ball - Rolls more, causes weight block to "stand up" earlier, reduces entry angle.
2. Increase hand rotation - Delays roll, delays weight block to "stand up", increase entry angle, produces extra skid in heads and midlanes when oil is present
3. Rev rate altering: This is the throttle for the above, ie. increasing the rev rate increases the effects above and decreasing rev rates decreases the effects above.
4. Bowler induced torq (Grabbing at the bottom to produce a whipping type of revolutions to the ball which is not advocated in todays games but is still usefull): Simply delays all the above reactions down the lane for extra length.
How to use them:
If you notice the midlane producing more revolutions on the ball (the ball grabbing the lane sooner) then you can choose either to stay behind the ball more thereby reducing the effect of the ealier reaction, or rotate around the ball thereby producing more skid but increasing entry angle. The later is the most riskiest because oil moves down the lane and more rotation causes more skid/snap and I have expereinced sudden unexpected 2,10 combonation. However, this move has the biggest potential payoff because of increased entry angle.
If you notice more loping in the midlane then is the time to increase rev rates and or stay behind the ball more to facilitate the ball standing up sooner. Staying behind the ball more usually produces longer length so when I do this I usually tighten my feet a board or so when making this adjustment.
These are just two examples... but by studying the midlane, doing some experimenting, following some predetermined expectation of changes, you can learn for yourself how and when to make release changes.
As a side note: I have always preached starting your bowling session "in the middle". By this I mean, using your "middle" ball speed with your "middle" release and then match the ball to the condition. With this done, you have room to make changes to your ball reaction with YOUR "tools" (speed, release, leverage ...etc) in your tool bag thereby maximizing you personal talent.
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