Breaking with 12.4/12.9 vs BKRUSH shaft/Powebreak G-Mezz shaft?

rack runner

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Afternoon all! This is bound to open a can of worms of OPINIONS, so for the most part, only looking for people who have actual first hand experience or POSITIVE theoretical suggestions.

I know we go round and round trying to find out if the bkrush shaft is the 12.9 shaft in disguise. "Is it the same shaft? What location/is the location the same for the metal slug for weight in the shaft? Is the vault plate the same material, if not what are the differences? Is there a difference in wall thickness between the 12.9 and bkrush?"

All those questions just being the tip of the iceberg of questions regarding mysterious proprietary materials used, my question/curiosities are:
-Of the people probably using 12.4/12.9 and other CF LD PLAYING shafts to break with, what have your experiences been? positive/negative/mixed?
-Seeing as it is easier to get a playing shaft vs a bkrush/powerbreak shaft by itself, is this one of the reasons to just break with a cf playing shaft?
-If youve had success with this method (breaking with a cf playing shaft) in terms of 2 things: 1) shaft not exploding and 2) consistent and efficient results, would you mind sharing the things youve experimented with all the way to what youve settled on now.

Thank you all in advanced,
Humbly
rack runner
 
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