Sounds like you're overdoing extensor action. Some people may not like me saying this, this way but oh well:
Extensor action is just simply there to keep your left arm straight. Thats it. If you have problems of breaking down your left arm throughout the swing, THEN worry about it. If you don't, don't worry about it and focus more on something you need to fix.
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I'm not a TGM or PGA certified Pro, but I did stay at a Holiday Inn Express last night
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