Jorge,
The problem of tweaking too many changes is that doing so at once is not an easy task.
Also, from experience, even though you've paid a knowledgeable expert to help you with your game, it is ultimately up to you to discern which recommendations that he has made apply to your game best—you must feel comfortable with the suggestions made, after having given them a little time to try to make them work.
Based on personal experience, learning is something that is constant. I’ve never had actual coaches per se (although when I was about 20 years old and used to practice all the time, there was this old-timer that would stand behind me and keep repeating either 1 or all of 3 things: a- your feet were too fast, b-stay behind the ball, and c-follow-thru, which to this day I am forever thankful to him, as when I feel slightly off, his words come to mind, and I concentrate on those keys) , I’ve learned that often times there is something that we can do different that will make our game just that much better, no matter how minute the change.
In essence, break down Jasnau’s suggestions, and try to figure out what’s keeping you from performing better.
What may be an excellent piece of advice for some, may not be that advantageous for others, and this much is made evident simply by watching some excellent bowlers throw the rock many different ways, while seemingly incorporating some very awkward form that is contrary to those that preach to do things “by the bookâ€.
Do things right, but also do ONLY what feels comfortable to you.
Good luck to your continuing quest for better bowling knowledge and form.
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Regards,
BowlingWolf